# Surf for More Math

## CHAPTER 3: ADDITION AND SUBTRACTION STRATEGIES

**Lesson 10: Solving Missing-Part Problems**

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

**Goal**

Identify and use patterns in an addition table.

Create a story problem for a given solution.

[C, CN, PS, R, V]

**Instructions for Use**

**Little Animals Activity Centre, Addition and Subtraction** lets students solve missing-part addition and subtraction problems.

To use Little Animals Activity Centre, Addition and Subtraction, count the spots on the back of the ladybirds and choose the right number to complete the sum or difference.

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**Complete the Addition Sentence** provides students with practice on working with finding the missing number in an addition sentence.

To use Complete the Addition Sentence, enter the missing number in the space provided. Click “Submit” to check your answer. When you have completed a certain number of questions, click “Submit & finish” to view a summary of your score

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**Complete the Subtraction Sentence** provides students with practice on working with finding the missing number in a subtraction sentence.

To use Complete the Subtraction Sentence, enter the missing number in the space provided. Click “Submit” to check your answer. When you have completed a certain number of questions, click “Submit & finish” to view a summary of your score.