# Surf for More Math

## CHAPTER 3: ADDITION AND SUBTRACTION STRATEGIES

**Lesson 2: Relating Subtraction to Addition**

Use these interactive activities to encourage students to have fun on the Web while learning about relating subtraction to addition. Students can try these activities on their own or in pairs.

**Goal**

Use fact families to relate addition and subtraction.

**Builds Upon**

Student Book pages 60–61

**Instructions for Use**

Flower Power asks students 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 students complete addition sentences, making students 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.