All Algebra Videos listed alphabetically by topic
Arithmetic with Positive and Negative Numbers
These videos show you how to add, subtract, multiply and divide when working with positive and negative numbers. Models are used to explain and show why the rules make sense. The one on Exponents deals with positive exponents, but base might be negative, or negative signs may be in front of the base.
Adding Integers
Shows how to add postive and negative numbers; uses counters.
http://www.youtube.com/watch?v=AIWPLvTNhXs
Subtracting Integers
Shows how to subtract postive and negative numbers; uses counters. Explains adding the opposite and two stroke method.
http://www.youtube.com/watch?v=0sMIJkFV1uw
Multiplying & Dividing Positive & Negative Numbers
Shows the rules for multiplying and dividing negative and positive numbers. Shows why negative times negative produces a negative number using counters.
http://www.youtube.com/watch?v=489iteE0EB4
Exponents - Basics
Covers the basic meaning of exponents that are whole numbers and how to evaluate and simplify expressions. Also defines zero exponent.
http://www.youtube.com/watch?v=i4m9jMGv4AA
Distributive Property
Distributive Property Part 1 - pos numbers
Distributive property of multiplication over addition, part 1. No negative numbers or subtraction.
http://www.youtube.com/watch?v=whWAt97VeBU
Distributive Property Part 2
Distributive property of multiplication over addition, part 2. More advanced: neg numbers and subtraction.
http://www.youtube.com/watch?v=6PH2eI8h9Sw
Simplifying Algebraic Expressions
Explains how to simplify algebraic expressions by adding, subtracting, combining like terms, as well as using the distributive property
http://www.youtube.com/watch?v=YURDKBg9-Aw
Dividing Polynomials
Divide a Polynomial by a Monomial
Explains and shows examples of how to Divide a Polynomial by a Monomial
http://www.youtube.com/watch?v=uERRlY-WmmU
Divide Polynomials using long division - Part 1
Part 1 of how to divide a Polynomial by a Polynomial using long division.
http://www.youtube.com/watch?v=P1hoVymb5hw
Dividing polynomials using long division-Part 2
This is Part 2 of Dividing Polynomials using long division. The example shows how to divide a polynomial with 4 terms by a binomial. See Part 3 for how to check the answer to this problem.
http://www.youtube.com/watch?v=-30vS5QL6O0
Divide Polynomials using long division - Part 3
This is Part 3 of Dividing Polynomials using long division. Part 2 shows how to divide a polynomial with 4 terms by a binomial. Part 3 shows how to check the answer to the problem in part 2.
http://www.youtube.com/watch?v=8IFxmHc3w7E
Dividing polynomials using long division-Part 4
This is Part 4 of Dividing Polynomials using long division, which shows more examples, and shows the subtraction part a little differently than shown in Part 2.
http://www.youtube.com/watch?v=YqV1lIOBVzk
Exponents
Exponents - Basics
Covers the basic meaning of exponents that are whole numbers and how to evaluate and simplify expressions. Also defines zero exponent.
http://www.youtube.com/watch?v=i4m9jMGv4AA
Exponents 1-definition, meaning and evaluating
Shows how to evaluate problems b^n with positive exponents, but where base may be negative. Explains difference when negative sign is in or out of the parentheses.
http://www.youtube.com/watch?v=AneubQTnoL4
Exponents 2-Exponents and Evaluating Expressions
Shows how to evaluate variable expressions containing exponents,focusing on when you replace a variable base with negative numbers.
http://www.youtube.com/watch?v=BsYSCKyFcYs
Exponents 3-Product Rule for Exponents
http://www.youtube.com/watch?v=jjajaVnVQKY
Exponents 4 - Quotient Rule and Zero Exponent
Develops the Quotient Rule for Exponents and the meaning of a zero exponent.
http://www.youtube.com/watch?v=VLJTJxjPUOA
Exponents 5 - Power Rule
Develops the Power Rule for Exponents and Product of a Power or Quotient Rule, and examples using more than one rule.
http://www.youtube.com/watch?v=HNJdc5Sqx1I
Exponents 6 Negative Exponents part 1
Develops the meaning of negative exponents and how to simplify expressions with negative exponents.
http://www.youtube.com/watch?v=oHNe8AK0E9M
Exponents 7-Negative Exponents part 2
Part 2 of negative exponents and how to simplify expressions with negative exponents.
http://www.youtube.com/watch?v=heUUBzvYA1o
Exponents 8-Negative exponents part 3
Part 3 of negative exponents and more examples of simplifying expressions with negative exponents.
http://www.youtube.com/watch?v=CrJEOQh5UXg
Evaluating Algebraic Expressions
Evaluating Algebraic Expressions 1
Part 1 of Evaluating Basic Algebraic Expressions; no negative numbers
http://www.youtube.com/watch?v=Sa6bBkztsoo
Evaluating Algebraic Expressions 2
Part 2 - includes replacing variables with negative numbers, using order of operations, and simplifying.
http://www.youtube.com/watch?v=7vt6IerxYdw
Factoring
Factoring 1-Factor out GCF
This shows the basics of factoring a polynomial by factoring out the greatest common factor.
http://www.youtube.com/watch?v=WOCCSoaZRv8
Factoring 2-Factor out a negative GCF
This is part 2 on factoring, and covers how to factor out a negative sign, and also how to recognize opposites such as a - b and b - a.
http://www.youtube.com/watch?v=bLI6NOZ8kdY
Factoring 3-Factor out GCF - trickier
This videos covers factoring out the GCF for more complicated problems.
http://www.youtube.com/watch?v=N9Yg6pVGP7A
Factoring 4a-Factor 4 terms by grouping
This video covers how to factor 4 terms into 2 binomials by using the traditional factoring by grouping method.
http://www.youtube.com/watch?v=2MtsZRjxjMo
Factoring 4b-Use Box to factor 4 terms
This video covers how to factor 4 terms into 2 binomials by using a nontraditional method using a BOX.
http://www.youtube.com/watch?v=64qzpRRCzUk
Factoring 5-Find 2 #s with given product & sum
This video shows you how to methodically find 2 numbers with a given sum and product. This could be useful when factoring quadratic trinomials into the produce ot 2 binomials. So this video is preparation for that, which begins in Factoring Part 6.
http://www.youtube.com/watch?v=06RdArZXthg
Factoring 6-Basic Trinomials Part I
This video (part 1) shows a method of factoring a basic trinomial of the form x-squared + bx + c into the product of 2 binomials using the product and sum approach.
http://www.youtube.com/watch?v=BaNTQw06uAA
Factoring 7-Basic Trinomials Part 2
This is part 2 of factoring basic trinomials. More examples and situations are covered, including factoring out GCF first, trinomials that don't factor, more than one variable, etc.
http://www.youtube.com/watch?v=BG53n9Ef4fM
Factoring 8-Trinomials Part 1-Trial Factors
This is part 1 of factoring trinomials into 2 binomials when the coefficient of x-squared is not 1. This is an introduction to the trial factors method.
http://www.youtube.com/watch?v=thMv6JovewA
Factoring 9 - Trinomials Part 2 - Get one factor!
This is part 2 of factoring trinomials into 2 binomials when the coefficient of x-squared is not 1. This is an introduction to a sneaky way of finding one correct factor using the product/sum approach, and from that, easily finding the other factor
http://www.youtube.com/watch?v=ZNfvctmIVzw
Factoring 10 - Trinomials part 3 - get one factor!
This is part 3 of factoring trinomials into 2 binomials when the coefficient of x-squared is not 1. It is a continuation of part 2 showing three more examples of using the short-cut (sneaky) method of first finding one correct factor using the product and sum.
http://www.youtube.com/watch?v=9RN_QAHtmfw
Factoring 11 - Trinomials Part 4
This is part 4 of factoring non-basic trinomials into 2 binomials by Factoring by Grouping. Explains why using the sum and product idea works when rewriting the middle term as the sum of two terms.
http://www.youtube.com/watch?v=85a9bkP85ag
Factoring 12 - Trinomials Part 5
This is part 5 of factoring non-basic trinomials into 2 binomials. More examples using factoring by grouping, and the box method.
http://www.youtube.com/watch?v=ld4VT_ml3Nk
Factoring 13 - Trinomials Part 6
This is part 6 of factoring non-basic trinomials into 2 binomials. More examples using a BOX method, which is an alternative to factoring by grouping.
http://www.youtube.com/watch?v=a1VOMsR8iZo
Factoring 14a - Trinomials Part 7
This is part 7 of factoring non-basic trinomials into 2 binomials. More practice factoring trinomials using various methods. Also covers factoring trinomials when the coefficient of the squared variable is negative, and factoring completely by factoring out the greatest common factor first.
http://www.youtube.com/watch?v=DTYnwV86nAM
Factoring14b-Trinomials part 8 New Method
Trinomials part 8 - This is part 8 using a new method to factor non-basic trinomials. This is a non-traditional, but easy way to factor trinomials.
http://www.youtube.com/watch?v=M_1mvgT6QgI
Factoring 15a - Difference of 2 Squares
Covers the formula for the factoring the difference of two squares, including examples.
http://www.youtube.com/watch?v=Fwqh9vq0sq8
Factoring 15b - Difference of 2 Squares part 2 newer
Covers more involved factoring of difference of 2 squares.
http://www.youtube.com/watch?v=PY39ZW3_B14
Factoring 16 Sum of 2 squares is prime
Emphasizes that the sum of two perfect squares usually is non-factorable over the integers and is prime.
http://www.youtube.com/watch?v=ziWn6u5_i6g
Factoring 17-Perfect Square Trinomials
Shows how to recognize and factor Perfect Square Trinomials.
Added: April 27, 2009, 02:05 PM
http://www.youtube.com/watch?v=LdOgluTLBxQ
Factoring 18-Sum and Difference of 2 Cubes
Covers how to factor the Sum and Difference of 2 Cubes, including more complex problems.
http://www.youtube.com/watch?v=icm6zjdOYek
Multiplying Polynomials
You need to know the basic laws of exponents. See Exponents.
Multiplying a Monomial by a Monomial
Shows how to multiply a monomial by a monomial (one term by another term).
http://www.youtube.com/watch?v=WIRcIvtr5eo
Multiplying 2 polynomials
Shows how to mulitply two polynomials with any number of terms using the box method and other methods
http://www.youtube.com/watch?v=2MGvBuNp7U8
Multiplying 2 binomials using the Foil or Smiley Face Method
Explains how to Multiply 2 binomials using the Foil or Smiley Face Method
http://www.youtube.com/watch?v=FOD8L-CSSlo
Negative Numbers
These videos show you how to add, subtract, multiply and divide when working with positive and negative numbers. Models are used to explain and show why the rules make sense. The one on Exponents deals with positive exponents, but base might be negative, or negative signs may be in front of the base.
Adding Integers
Shows how to add postive and negative numbers; uses counters.
http://www.youtube.com/watch?v=AIWPLvTNhXs
Subtracting Integers
Shows how to subtract postive and negative numbers; uses counters. Explains adding the opposite and two stroke method.
http://www.youtube.com/watch?v=0sMIJkFV1uw
Multiplying & Dividing Positive & Negative Numbers
Shows the rules for multiplying and dividing negative and positive numbers. Shows why negative times negative produces a negative number using counters.
http://www.youtube.com/watch?v=489iteE0EB4
Exponents - Basics
Covers the basic meaning of exponents that are whole numbers and how to evaluate and simplify expressions. Also defines zero exponent.
http://www.youtube.com/watch?v=i4m9jMGv4AA
Order of Operations
Exponents - Basics
Covers the basic meaning of exponents that are whole numbers and how to evaluate and simplify expressions. Also defines zero exponent.
http://www.youtube.com/watch?v=i4m9jMGv4AA
Order of Operations Part 1
Part 1 of Order of Operations: Explains the order of operations, what it means, and shows examples. Basic--no negative numbers or fractions.
http://www.youtube.com/watch?v=ahwlw4OCEAc
Order of Operations Part 2
Part 2 of Order of Operations: Shows examples. Basic--no negative numbers, but does contain fractions.
http://www.youtube.com/watch?v=NCixeuWvLS0
Order of Operations Part 3
Part 3 of Order of Operations: Shows examples. Basic--contains fractions but no negative numbers.
http://www.youtube.com/watch?v=EpX9ohiti6o
Exponents 1-definition, meaning and evaluating
Shows how to evaluate problems b^n with positive exponents, but where base may be negative. Explains difference when negative sign is in or out of the parentheses.
http://www.youtube.com/watch?v=AneubQTnoL4
Order of Operations Part 4
Part 4 of Order of Operations: Shows examples. Contains fractions and negative numbers.
http://www.youtube.com/watch?v=a329hvX8yDA
Order of Operations Part 5
Part 5 of Order of Operations: Shows examples. Contains absolute value, negative numbers, fractions, decimals
http://www.youtube.com/watch?v=Th8TBYEuRgc
Positive and Negative Numbers
These videos show you how to add, subtract, multiply and divide when working with positive and negative numbers. Models are used to explain and show why the rules make sense. The one on Exponents deals with positive exponents, but base might be negative, or negative signs may be in front of the base.
Adding Integers
Shows how to add postive and negative numbers; uses counters.
http://www.youtube.com/watch?v=AIWPLvTNhXs
Subtracting Integers
Shows how to subtract postive and negative numbers; uses counters. Explains adding the opposite and two stroke method.
http://www.youtube.com/watch?v=0sMIJkFV1uw
Multiplying & Dividing Positive & Negative Numbers
Shows the rules for multiplying and dividing negative and positive numbers. Shows why negative times negative produces a negative number using counters.
http://www.youtube.com/watch?v=489iteE0EB4
Exponents - Basics
Covers the basic meaning of exponents that are whole numbers and how to evaluate and simplify expressions. Also defines zero exponent.
http://www.youtube.com/watch?v=i4m9jMGv4AA
Rational Expressions - simplify, add, subtract, multiply
Rational Expressions 1 - Introduction
This is an introduction to Rational Expressions in beginning algebra.
http://www.youtube.com/watch?v=4pLmr0DA_18
Rational Expressions 2 - Simplifying
Examples of simplifying algebraic rational expressions by factoring the numerator and denominator in order to cancel factors to reduce the rational expression to a simplified form.
http://www.youtube.com/watch?v=WAdyzHwd_NU
Rational Expressions 3 - Multiplication new
Examples of multiplying and simplifying algebraic rational expressions by first factoring the numerators and denominators in order to cancel factors to reduce.
http://www.youtube.com/watch?v=QF2mK9ksV3k
Rational Expressions 4 - Dividing
Examples of dividing rational expressions by first multiplying by the reciprocal, and then factoring the numerators and denominators in order to cancel factors to reduce the rational expression to a simplified form.
http://www.youtube.com/watch?v=TfjHpdNESHM
Rational Expressions 5 - Adding with Common Denominator
How to add rational expressions that already have a common denominator, and how to simplify if it is possible to cancel.
http://www.youtube.com/watch?v=gPyrMluzus8
Rational Expressions 6 - Subtracting with Common Denominator
How to subtract rational expressions that already have a common denominator, and how to simplify if it is possible to cancel.
http://www.youtube.com/watch?v=shKYIVg3rno
Simplifying Expressions
Terms and Coefficients
Defines terms and coefficients and variable part of a term in preparation for combining like terms.
http://www.youtube.com/watch?v=qAcim0Noh5g
Combining Like Terms
Explains how to add, subtract, combine like terms in algebraic expressions
http://www.youtube.com/watch?v=lE8qjfAnDkk
Distributive Property Part 1 - pos numbers
Distributive property of multiplication over addition, part 1. No negative numbers or subtraction.
http://www.youtube.com/watch?v=whWAt97VeBU
Distributive Property Part 2
Distributive property of multiplication over addition, part 2. More advanced: neg numbers and subtraction.
http://www.youtube.com/watch?v=6PH2eI8h9Sw
Simplifying Algebraic Expressions
Explains how to simplify algebraic expressions by adding, subtracting, combining like terms, as well as using the distributive property
http://www.youtube.com/watch?v=YURDKBg9-Aw
Solving Equations with one variable
Solving Linear Equations (exponent on the variable is 1) and Word Problems using one variable and a linear equation.
Solving Linear Equations
SOLVING EQUATIONS--See lower down the page for Word Problems
Check solutions of Equations
Videos by Julie Harland http://yourmathgal.com
Shows how to decide if a given number is a solution to an equation.
Raw File: checksoln.mov on pc
http://www.youtube.com/watch?v=z5g1hotjDts
PARTS 1 - 4 cover the basics of solving equations using the addition property of equality.
Part 4 also covers how to solve equation like -x = 4 by taking the opposite of both sides of the equation.
Solving Linear Equations Part 1
Part 1 of Solving Linear Equations in one variable. Covers examples solving equations using the addition property of equality.
http://www.youtube.com/watch?v=vBfIwe33nGY
Solving Linear Equations Part 2
Part 2 of Solving Linear Equations; Covers examples solving equations using the addition property of equality,
http://www.youtube.com/watch?v=no_7fhCYncY
Solving Linear Equations Part 3
Part 3 of Solving Linear Equations; Covers examples solving equations using the addition property of equality,
http://www.youtube.com/watch?v=MA2-tCfmQnw
Solving Linear Equations Part 4
Part 4 of Solving Linear Equations in one variable. Covers examples solving equations using the addition property of equality, and solving -x = b, etc.
http://www.youtube.com/watch?v=Oi1H_3WsOiU
Solving Linear Equations Part 5
Part 5 of Solving Linear Equations in one variable. Covers solving linear equations using the multiplication property of equality and how to clear denominators when fractions are involved.
http://www.youtube.com/watch?v=zWk1fpVB1KE
Solving Linear Equations Part 6
Part 6 of Solving Linear Equations in one variable. Covers solving linear equations using the multiplication property of equality and how to clear denominators when fractions are involved.
http://www.youtube.com/watch?v=tbiROnq_Fkk
Solving Linear Equations Part 7
Part 7 of Solving Linear Equations in one variable. Covers solving linear equations using the multiplication property of equality and how to clear denominators when fractions are involved.
http://www.youtube.com/watch?v=c8H1kqK1XnA
Solving Linear Equations Part 8
Part 8 of Solving Linear Equations in one variable. Covers solving linear equations using the multiplication property of equality and how to clear denominators when fractions are involved.
http://www.youtube.com/watch?v=KmnX8yA15Ak
Solving Linear Equations Part 9
Part 9 of Solving Linear Equations in one variable. Covers solving linear equations using the multiplication property of equality and how to clear denominators when fractions and decimals are involved.
http://www.youtube.com/watch?v=VbAyYNQtQy0
Literal Equations-solving an equation for one variable in a formula
Part 1 of solving for one variable in a formula.
http://www.youtube.com/watch?v=rS4JPQE4WHw
Part 2 of solving for one variable in a formula.
http://www.youtube.com/watch?v=IaE5RTnL8C8
WORD PROBLEMS using one variable in a linear equation
Percent Mixture Word Problems
Percent Mixture Problem #1
Explains using picture how to solve this percent mixture problem using one variable: How many pounds of dogfood that is 50% rice must be mixed with 400 pounds of dogfood that is 80% rice to make a dogfood that is 75% rice?
http://www.youtube.com/watch?v=gD2YfPU-qMM
Percent Mixture Problem #2
Explains using picture how to solve this percent mixture problem using one variable: Ten quarts of pure apple juice are added to 90 quarts of a fruit juice that 10% pure apple juice. What is the percent concentration of pure apple juice in the resulting mixture?
http://www.youtube.com/watch?v=iymFmROuLik
Percent Mixture Problem #3
Explains using picture how to solve this percent mixture problem using one variable: Five pounds of candy that is 20% chocolate is combined with a candy that is 40% chocolate. How many pounds of the candy that is 40% chocolate should be used to get a candy that is 25% chocolate?
http://www.youtube.com/watch?v=rowwhpgwVhU
Percent Mixture Problem #4
Videos by Julie Harland http://yourmathgal.com
Explains using picture how to solve this percent mixture problem using one variable: How much water should be added to 30 cups of juice that is 70% juice to get a diluted mixture that is only 60% juice?
Raw File: percentmix4.mov on pc
http://www.youtube.com/watch?v=VEjt_Vhuf5s
Rate-Time-Distance (Uniform Motion) Word Problems: rt=d
Below is an introduction to and several Distance or Uniform Motion Problems which are solved on the videos using one variable and a linear equation. These are also referred to as Rate-Time-Distance Problems, and use the formula R·T=D.
Rate-Time-Distance Intro: rt=d
Videos by Julie Harland http://yourmathgal.com
This is an introduction to solving word problems on uniform motion (rate-time-distance) using the formula rate x time = distance, or rt=d. Six problems are introduced, and preliminary pictures are drawn. All problems are solved in subsequent videos.
Raw File: Intro rt=d.mov on mac
http://www.youtube.com/watch?v=27yVkcVwNDU
Rate-Time-Distance Problem 1
Solves this word problem using uniform motion rt=d formula: Two cyclists start at the same corner and ride in opposite directions. One cyclist rides twice as fast as the other. In 3 hours, they are 81 miles apart. Find the rate of each cyclist. Answer: 9 mph and 18 mph
http://www.youtube.com/watch?v=SBTAFvqMlfk
Rate-Time-Distance Problem 2
Solves this word problem using uniform motion rt=d formula: A jogger started running at an average speed of 6 mph. Half an hour later, another runner started running after him starting from the same place at an average speed of 7 mph. How long will it take for the runner to catch up to the jogger? Answer: 3 hours
http://www.youtube.com/watch?v=hxz_WC1Jpmg
Rate-Time-Distance Problem 3
Solves this word problem using uniform motion rt=d formula: A 555-mile, 5-hour trip on the Autobahn was driven at two speeds. The average speed of the car was 105 mph on the first part of the trip, and the average speed was 115 mph for the second part. How long did the car drive at each speed? Answer: 105 mph for 2 hours and 115 mph for 3 hours
http://www.youtube.com/watch?v=jcETNCbcGsY
Rate-Time-Distance Problem 4
Solves this word problem using uniform motion rt=d formula: Andy and Beth are at opposite ends of a 18-mile country road with plans to leave at the same time running toward each other to meet. Andy runs 7 mph while Beth runs 5 mph. How long after they begin will they meet? Answer: 1.5 hours
http://www.youtube.com/watch?v=lh3w61ohwro
Rate-Time-Distance Problem 5
Solves this word problem using uniform motion rt=d formula: A car and a bus set out at 2 pm from the same spot, headed in the same direction. The average speed of the car is twice the average speed of the bus. After 2 hours, the car is 68 miles ahead of the bus. Find the rate of the bus and the car. Answer: Bus speed: 34 mph; Car speed: 68 mph
http://www.youtube.com/watch?v=rGkJ8hyHIJE
Rate-Time-Distance Problem 6
Solves this word problem using uniform motion rt=d formula: A pilot flew from one city to another city averaging 150 mph. Later, it flew back to the first city averaging 100 mph. The total flying time was 5 hours. How far apart are the cities? Answer: 300 miles
http://www.youtube.com/watch?v=wwTVSZUpNgw
Solving Non-Linear Equations
Solving Equations by Factoring 1
Covers zero-product property and part 1 of how to solve non-linear equations by factoring.
http://www.youtube.com/watch?v=hadbOzKIdys
Solving Equations by Factoring 2
Covers zero-product property and part 2 of how to solve non-linear equations by factoring.
http://www.youtube.com/watch?v=uvqFKHU-fjg
Quadratic Formula Song and more
In this video, I show you the solutions to a general quadratic equation which is the quadratic formula. Then, I show you the words to a song you can sing to "Pop goes the weasel" and sing it. It's easier to remember the formula if you memorize the song. Also included is how to complete the square in order to derive the quadratic formula, showing all the steps.
http://www.youtube.com/watch?v=uK_RWZ1L9tE
Solve Word Problems that produce Non-Linear Equations where you can factor to solve.
WP1-Solve number puzzle by factoring
This is a Word Problem you solve by writing an equation and factoring. Word Problem 1 - Number Puzzle-The square of a negative number is 15 more than twice the negative number. What is the number?
http://www.youtube.com/watch?v=HOxLak15pY8
WP2-Solve Triangle if you know perimeter
This is a Word Problem you solve by writing an equation and factoring. Word Problem 2 - Perimeter of a Triangle-The perimeter of a given triangle is 85 meters. By looking at the picture, state the lengths of the sides of the triangle.
http://www.youtube.com/watch?v=AcGK5JL_aqk
WP3-Solve Rectangle if you know area
This is a Word Problem you solve by writing an equation and factoring. Word Problem 3 - Area of a Rectangle-Use the info from a picture of a rectangle to find the length and width is its area is 54 sq. ft.
http://www.youtube.com/watch?v=1DE17TuY8Rw
WP4-Solve triangle if you know area
This is a Word Problem you solve by writing an equation and factoring. Word Problem 4 -Area of a Triangle-The height of a triangle is 4 inches more than twice the length of the base. The area of the triangle is 35 square inches. Find the height of the triangle.
http://www.youtube.com/watch?v=EZjhKZU4Rko
WP5-Solve triangle using Pythagorean theorem
This is a Word Problem you solve by writing an equation and factoring. Word Problem 5 - Pythagorean Theorem-Find the lengths of the sides of the right triangle shown on the diagram.
http://www.youtube.com/watch?v=5TPrdcpgtX8
WP6-Find time using physics formula
This is a Word Problem you solve by writing an equation and factoring. Word Problem 6 - Physics ball falling application-Use the formula given to do this problem. A ball is thrown on a hard surface and bounces straight up. The initial velocity of the rebound is 64 feet per second. How many seconds later will the ball hit the ground?
http://www.youtube.com/watch?v=CepqshwePog
WP7-Find interest rate based on investment formula
This is a Word Problem you solve by writing an equation and factoring. Word Problem 7 - Investment problem-At the end of 2 years, P dollars invested at an interest rate r compounded annually increases to an amount, A dollars, given by a formula shown in video. Find the interest rate if $2000 increased to $2420 in 2 years. Write the answer as a percent.
http://www.youtube.com/watch?v=5vGMzZpXEBg
Solving Systems of Linear Equations with 2 variables
Solve System by Substitution - part 1
This is part 1 of how to solve a system of equations using the substitution method. The first system solved is 2x - y = -5 and y = x + 4. The second system solved is 3x + y = -14 and 4x + 3y = -22.
http://www.youtube.com/watch?v=ZqEDFqX4OwE
Solve System by substitution - part 2
This is part 2 of how to solve a system of equations using the substitution method. It covers special cases--a dependent system when the 2 equations are the same, and therefore the solution is infinitely many ordered pairs. The other is an inconsistent system, so there is no solution.
http://www.youtube.com/watch?v=1hsE9KYKA5g
WORD PROBLEMS USING TWO VARIABLES that have linear equations
Solving a Mixture Problem using 2 variables
This video shows how to solve the following mixture problem using algebra by writing a system of equations with 2 variables. Problem: Mia wants to make a punch by mixing some apple juice costing $2.25 per quart with cranberry juice costing $3.25 per quart. How many quarts of each should she use if she wants to make 100 quarts costing $2.50 per quart?
http://www.youtube.com/watch?v=Wz7ZW2sIDbA
FUN STUFF
Easy Ways to Multiply by 9
This video shows you easy ways to multiply single digits by 9, and larger numbers when all the digits are the same, like 88888 x 9...really easy and fun to do!
http://www.youtube.com/watch?v=VFHDn4TKHDM
Fun Pattern squaring numbers whose digits are all ones
fun pattern for multiplying numbers by themselves (squaring) if all its digits are 1....like 11 x 11 or 11111 x 11111, etc. Show your friends!
http://www.youtube.com/watch?v=xTffv1lpwGg
Numerals
Shows the original numerals and the code for how it was obvious what each numeral stood for. These are referred to as the Arabic numerals, the Hindu numerals, Hindu-Arabic numerals and/or the Indian numerals. I do not know the exact origins.
http://www.youtube.com/watch?v=bwQpCJroCac