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Addition and Subtraction

Addition and Subtraction

Author: Heidi Santos

3rd Grade

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Addition and Subtraction without Regrouping Review

In this video, students will review how to add and subtract without regrouping.

Addition with Regrouping

Using base-10 blocks, students will be shown what actually happens when regrouping takes place in addition problems.

Subtraction with Regrouping

Using base-10 blocks, students are shown what is actually taking place when they regroup in a subtraction problem.

Subtraction with Multiple Regroupings

In this video, students will practice regrouping more than once in subtraction problems.

Subtracting Across Zeros

Using the "boxing method", students will learn what to do to solve subtraction problems when they are unable to regroup from columns with zeros.

Double-Checking Your Work

In this video, students will learn to check their addition and subtraction problems by "flipping" the problem and solving the inverse.

Solving Word Problems

In this video, students will learn to use the "cubes" method to solve addition and subtraction word problems.

What Is Estimation?

In this video, students will be introduced to a "real world" example of the usefulness of estimation.

Front End Estimation

In this video, students will learn how use Front End Estimation to solve problems where an "estimate" is required.