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Subtraction Shortcuts and Tips
By Monica Yuskaitis
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Subtracting Across Zeros
3 0 2 1 9 8
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Step 1 – Borrow 1 from the 30 3 0 2 1 9 8
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Step 2 – Cross out the 30 3 0 2 1 9 8
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Step 3 – Write a 29 above the 30 2 9 3 0 2 1 9 8
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Step 4 – Write a 1 in front of the 2
2 9 3 0 2 1 9 8 1
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Step 5 – Subtract 8 from 12 2 9 3 0 2 1 9 8 1 4
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Step 6 – Subtract 9 from 9 2 9 3 0 2 1 9 8 1 4
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Step 7 – Subtract 1 from 2 2 9 3 0 2 1 9 8 1 1 4
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We’re Finished 2 9 3 0 2 1 9 8 1 1 4
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Second Example
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Step 1 – Borrow 1 from 800
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Step 2 – Cross out the 800
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Step 3 – Write 799 above the 800
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Step 4 – Write a 1 next to the 2
1
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Step 5 – Subtract 5 from the 12
1 7
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Step 6 – Subtract 6 from the 9
1 3 7
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Step 7 – Subtract 6 from the 9
1 2 3 7
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Step 7 – Subtract 3 from the 7
1 4 2 3 7
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We’re Finished 1 4 2 3 7
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It’s Your Turn 1 4 1 6 9
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It’s Your Turn Again 1 1 4 8
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Subtraction Tips
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Never subtract the top number from the bottom number
6 1 3 2 7 9 4 6 6 Your answer will always be wrong.
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Never borrow unless you need to
5 9 6 2 8 4 1 1 Your answer will always be wrong.
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Practice your subtraction facts
9 13 18 – 9 = 18 – 7 = 16 – 8 = 14 – 8 = 12 – 9 = 11 – 3 = 15 – 7 = 9 – 3 = 18 – 5 = 18 – 3 = 16 – 7 = 14 – 6 = 12 – 4 = 11 – 7 = 15 – 6 = 9 – 5 = 11 15 8 9 6 8 3 8 8 4 8 9 6 4
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