Math Support

The Rules of Divisibility

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Area of composite shapesLearn to break up irregular shapes into smaller geometric shapes to determine area.

Drawing a quadrilateral on the coordinate plane exampleSal draws a quadrilateral on the coordinate plane using the coordinates of its vertices.

Mean absolute deviation (MAD)Mean absolute deviation (MAD) of a data set is the average distance between each data value and the mean. Mean absolute deviation is a way to describe variation in a data set. Mean absolute deviation helps us get a sense of how "spread out" the values in a data set are.

Mean, median, & mode exampleHere we give you a set of numbers and then ask you to find the mean, median, and mode. It's your first opportunity to practice with us!

Statistics intro: Mean, median, & modeThe mean (average) of a data set is found by adding all numbers in the data set and then dividing by the number of values in the set. The median is the middle value when a data set is ordered from least to greatest. The mode is the number that occurs most often in a data set.

Statistical and non statistical questionsA statistical question is one that can be answered by collecting data and where there will be variability in that data. For example, there will likely be variability in the data collected to answer the question, "How much do the animals at Fancy Farm weigh?" but not to answer, "What color hat is Sara wearing?".

Statistical Questions

Videos

Basic Skills

Worked example: Subtracting 3-digit numbers (regrouping) Learn to use regrouping (borrowing) and place value to subtract 971-659.

Multiplying multi-digit numbersSal shows lots of examples for how to multiply 2- and 3-digit numbers using "standard algorithm".

Dividing whole numbers to get a decimalSal divides 63÷35.

Ordering fractions Lindsay orders 7/10, 1/3, and 5/6 using common denominators.

Compare fractions and mixed numbersPractice comparing fractions and mixed numbers that have unlike denominators.

Subtracting mixed numbers: 7 6/9 - 3 2/5Sal subtracts 3 2/5 from 7 6/9 by rewriting each mixed number to have a common denominator.

More on equivalent fractionsSal uses fraction models and multiplication to find equivalent fractions.

Intro to exponentsSal shows how exponents are repeated multiplication

Worked example: Order of operations (PEMDAS)Work through a challenging order of operations example with only positive numbers.

Prime Factorization.m4v

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