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