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Multi-Digit Addition and Subtraction Review
Multi-Digit Addition and Subtraction Review
Use these videos to review the basics of the standard algorithms for addition and subtraction, including with regrouping. Also review the decimal place values. Students must know these prior skills because this unit focuses on adding and subtracting decimals.
Helpful Videos:
Addition
How to Add Whole Numbers With Regrouping? | iQuestion PH (6:08)
Adding multi digit numbers with regrouping | Khan Academy (2:17)
Subtraction
Lesson 1: Mental Math
Lesson 1: Mental Math
In this lesson we used the properties of addition and reviewed strategies to solve problems mentally.
Helpful Videos:
Lesson 2: Estimate Sums and Differences of Decimals
Lesson 2: Estimate Sums and Differences of Decimals
In this lesson we used rounding and compatible numbers to estimate sums and differences.
Helpful Videos:
Lesson 3: Use Models to Add and Subtract Decimals
Lesson 3: Use Models to Add and Subtract Decimals
In this lesson we used models to show sums and differences of decimals. We touched on how regrouping works with decimals, and showed how decimals fit into the standard algorithms of addition and subtraction. Hint: Always line up the decimal point! Place matters!
Helpful Videos:
Add and Subtract Decimals Using Models | Stefanie Hanes (3:52)
Add & Subtract Decimals to the Hundredths Using Models | Underwater Math (2:09)
Adding and Subtracting Decimals with Models | Ms. Luke (2:20)
Standard Algorithm:
Lesson 4: Use Strategies to Add Decimals
Lesson 4: Use Strategies to Add Decimals
In this lesson we added decimals to the hundredths using partial sums and the standard algorithm.
Helpful Videos:
Lesson 5: Use Strategies to Subtract Decimals
Lesson 5: Use Strategies to Subtract Decimals
In this lesson we subtracted decimals to the hundredths using partial differences and the standard algorithm.
Helpful Videos:
Lesson 6: Problem Solving: Model with Math
Lesson 6: Problem Solving: Model with Math
In this lesson we used all of our prior math knowledge to solve problems using equations or bar diagrams.
Helpful Videos:
Bar Model Addition and Subtraction | Westfield Primary School (2:22)
*This video does not use decimals, but it shows the basics of using bar diagrams to model addition and subtraction.Algebra Video for Kids: Solve Equations with Variables | Star Toaster (4:02)
What's the Difference Between Expressions and Equations? | Math with Mr. J (3:40)
Review videos from Lesson 3.
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