# Using and explaining addition strategies

In this lesson, we will be learning how to use different addition strategies (e.g. partitioning, commutativity and rounding and adjusting) in order to solve Magic Squares.

# Video

Click on the play button to start the video. If your teacher asks you to pause the video and look at the worksheet you should:

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# Worksheet

These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

# Using and explaining addition strategies

Quiz to be completed following lesson on: 'Using and explaining addition strategies'.

## Question 5

Q1.1. Complete the following equation using your knowledge of number bonds: 74 + _____ = 100

1/5

Q2.2. Use the partitioning strategy to solve the following equation: 34 + 13 =

2/5

Q3.What is the law of commutativity?

3/5

Q4.4. Use the round and adjust strategy to solve: 71 + 16 =

4/5

Q5.5. Which strategy would be most appropriate/efficient when solving: 33 + 21 =

5/5

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

# Using and explaining addition strategies

Quiz to be completed following lesson on: 'Using and explaining addition strategies'.

## Question 5

Q1.1. Complete the following equation using your knowledge of number bonds: 74 + _____ = 100

1/5

Q2.2. Use the partitioning strategy to solve the following equation: 34 + 13 =

2/5

Q3.What is the law of commutativity?

3/5

Q4.4. Use the round and adjust strategy to solve: 71 + 16 =

4/5

Q5.5. Which strategy would be most appropriate/efficient when solving: 33 + 21 =

5/5

# Lesson summary: Using and explaining addition strategies

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