# Using and explaining addition and subtraction strategies

In this lesson, we will be learning how to use the most efficient addition and subtraction strategies. We will apply this knowledge to solving addition pyramids.

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.

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

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Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

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

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.

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

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

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

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

# 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:

• Click "Close Video"
• Click "Next" to view the activity

Your video will re-appear on the next page, and will stay paused in the right place.

# 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.

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

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

# Using and explaining addition and subtraction strategies

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

Q1.Use the 'round and adjust' strategy to solve: 398 + 212.

1/5

Q2.Use the 'find the difference by adding on' strategy to complete the equation: 438 + _____ = 620.

2/5

Q3.Use the 'partitioning for subtraction' strategy to solve: 487 - 134 =

3/5

Q4.Use addition and subtraction to find the missing part of this equation: 124 + ______ + 330 = 754

4/5

Q5.Use addition and subtraction to find the missing part of this equation: 389 + ______ + 421 = 924

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.

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

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

# Using and explaining addition and subtraction strategies

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

Q1.Use the 'round and adjust' strategy to solve: 398 + 212.

1/5

Q2.Use the 'find the difference by adding on' strategy to complete the equation: 438 + _____ = 620.

2/5

Q3.Use the 'partitioning for subtraction' strategy to solve: 487 - 134 =

3/5

Q4.Use addition and subtraction to find the missing part of this equation: 124 + ______ + 330 = 754

4/5

Q5.Use addition and subtraction to find the missing part of this equation: 389 + ______ + 421 = 924

5/5

# Lesson summary: Using and explaining addition and subtraction strategies

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## Time to move!

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

For 5 mins...

Move around:
Climb stairs

On the spot:
Chair yoga