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Tip A quick way to do these in your head
Count up instead: 72 − 38 → from 38 up to 40 is 2, from 40 up to 72 is 32, so the answer is 34.
Loading the drill…
Count up instead: 72 − 38 → from 38 up to 40 is 2, from 40 up to 72 is 32, so the answer is 34.