Use story clues to decide when to subtract. Spot words like left or gave away, then use − to find how many remain.
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You can find more about this topic by visiting BBC Bitesize - Adding and subtracting
12 - 4 = 8 so 8 books are left
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Minus means to take away
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Counting back from the larger number to the smaller one is useful when finding 'less than'
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Subtract means to take away
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The other 3 options are true but in maths 'difference' means to take away. To find the difference between two numbers, subtract the smaller from the larger
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17 cakes are eaten, so 24 - 17 = 7
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The two subtractions should give the same answer, which is 6
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20 - (5 x 2) = 10
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90 - 25 = 65.
65 - 20 = 45 |
15 - 9 = 6
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