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Mental Subtraction Mastery
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Mental Subtraction Mastery
Work out each subtraction using a mental strategy. You can split numbers into tens and ones, count up, or adjust to a friendly number. Show your thinking where space is provided.
Warm-up: subtract mentally
Use place value to help you find each difference.
1.Find 57 − 24.
2.Find 69 − 31.
3.Find 84 − 42.
4.Find 76 − 15.
Choose a strategy
Think about which mental method makes each calculation manageable.
5.Which calculation shows a useful way to work out 80 − 36?
- Subtract 30, then subtract 6: 80 − 30 − 6
- Add 30, then add 6: 80 + 30 + 6
- Subtract 3, then subtract 6: 80 − 3 − 6
- Double 36, then add 80
6.Match each subtraction to its difference.
- 72 − 28
- 65 − 29
- 91 − 47
- 83 − 44
- 44
- 36
- 44
- 39
Take on a challenge
Use a helpful adjustment or count up to find each answer.
7.Find 93 − 57.
8.Find 82 − 48.
9.Use the number line to help find the difference between 81 and 46.
10.Explain one mental method for working out 86 − 49. Include the steps and the answer.
11.A bookshop has 74 copies of a storybook. It sells 28 copies. How many copies are left?
12.Amira has £80. She spends £37 on a backpack. How much money does she have left?
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