# Choosing appropriate subtraction strategies

In this lesson, we will look at subtraction equations and decide the best and most efficient strategy we could use to solve them.

#### 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.Mrs Crane is using the strategy near doubles to solve the following equation: 3014 + 3007 = ... Which of the following near doubles should she use to help her calculate the answer?

1/5

Q2.Mrs Crane is using the strategy near doubles to solve the following equation: 4136 + 4122 = ... Which of the following near doubles should she use to help her calculate the answer?

2/5

Q3.Mrs Crane is using the strategy round and adjust to solve the following: 4543 + 3003 = ... Which of the numbers in the equation should she use to round and adjust?

3/5

Q4.Mrs Crane is using the strategy round and adjust to solve the following: 3783 + 2998 = ... Which of the numbers in the equation should she use to round and adjust?

4/5

Q5.Using the strategy round and adjust, add the following three numbers together: 4001 + 3997 + 2005 =

5/5

#### 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.Mrs Crane is using the strategy near doubles to solve the following equation: 3014 + 3007 = ... Which of the following near doubles should she use to help her calculate the answer?

1/5

Q2.Mrs Crane is using the strategy near doubles to solve the following equation: 4136 + 4122 = ... Which of the following near doubles should she use to help her calculate the answer?

2/5

Q3.Mrs Crane is using the strategy round and adjust to solve the following: 4543 + 3003 = ... Which of the numbers in the equation should she use to round and adjust?

3/5

Q4.Mrs Crane is using the strategy round and adjust to solve the following: 3783 + 2998 = ... Which of the numbers in the equation should she use to round and adjust?

4/5

Q5.Using the strategy round and adjust, add the following three numbers together: 4001 + 3997 + 2005 =

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.

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

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

# Choosing appropriate subtraction strategies

Using what we have learnt today, can you answer the following questions?

Q1.Mrs Crane has used the strategy round and adjust to solve the following equation: 3567 - 2005 = ... which number should she round?

1/5

Q2.Mrs Crane has used the strategy round and adjust to solve the following equation: 4997 - 1564 = ... which number should she round?

2/5

Q3.Which is the most efficient strategy to solve the following equation: 5006 - 4992 =

3/5

Q4.Which is the most efficient strategy to solve the following equation: 7012 - 6991 =

4/5

Q5.Which is the most efficient strategy to solve the following equation: 4547 - 1345 =

5/5

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

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

# Choosing appropriate subtraction strategies

Using what we have learnt today, can you answer the following questions?

Q1.Mrs Crane has used the strategy round and adjust to solve the following equation: 3567 - 2005 = ... which number should she round?

1/5

Q2.Mrs Crane has used the strategy round and adjust to solve the following equation: 4997 - 1564 = ... which number should she round?

2/5

Q3.Which is the most efficient strategy to solve the following equation: 5006 - 4992 =

3/5

Q4.Which is the most efficient strategy to solve the following equation: 7012 - 6991 =

4/5

Q5.Which is the most efficient strategy to solve the following equation: 4547 - 1345 =

5/5

# Lesson summary: Choosing appropriate subtraction 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:
Chair yoga