## CHAPTER 3: ADDITION AND SUBTRACTION STRATEGIES

**Lesson 2: Relating Subtraction to Addition**

**Goal**

Use fact families to relate addition and subtraction.

**Instructions for Use**

Flower Power asks you to find the sums and differences of fact families.

Click the arrow to begin. Type the answer to each problem in the white boxes, then click “Check.” Click the arrow to go to the next problem.

Number Pyramid has you complete addition sentences, making you use fact families to solve the problems.

Select “Medium,” then click “Play” to begin. Read the problem at the top of the screen, then select an answer from the numbers below to fill the dotted line. Continue answering problems to help Molly get out of the pyramid.