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Tip A quick way to do these in your head
Bridge to the next ten: 47 + 8 → 47 + 3 = 50, then 5 more = 55. For 100 − 37: 37 + 3 = 40, 40 + 60 = 100, so 63.
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Bridge to the next ten: 47 + 8 → 47 + 3 = 50, then 5 more = 55. For 100 − 37: 37 + 3 = 40, 40 + 60 = 100, so 63.