# 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

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• Click "Close Video"
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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.

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Using and explaining addition strategies

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

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

1/5

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

2/5

Q3.What is the law of commutativity?

3/5

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

4/5

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

5/5

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Using and explaining addition strategies

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

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

1/5

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

2/5

Q3.What is the law of commutativity?

3/5

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

4/5

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

5/5

# Lesson summary: Using and explaining addition strategies

## Time to move!

Did you know that exercise helps your concentration and ability to learn?

For 5 mins...

Move around:
Jog

On the spot:
Dance