Year 4

# Choosing appropriate subtraction strategies

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## Lesson details

### Key learning points

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

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This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

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### 5 Questions

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?

3100 + 3100

4000 + 4000

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?

4000 + 4000

4200 + 4200

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?

4543

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?

3783

Q5.

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

10,000

8000

### 5 Questions

Q1.

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

3567

Q2.

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

1564

Q3.

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

Partitioning

Round and adjust

Q4.

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

Partitioning

Round and adjust

Q5.

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

Counting on

Round and adjust