3rd grade word problem

Find 64 - 27. I can add 3 to 27 to get 30. 64- 30 = 34. 34 - 3 = 31. So,  64 - 27 = 31?
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1 Answer

64-27=37

standard wae...64-7 become 50+14-7...50+7

then 50-20=30

30+7=37
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