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This is taught as a mental math strategy Typically you "break" each addend into tens and ones

to solve 45 + 32 the students do this: For example: 45 "breaks into" 40 + 5 Similarly 32 "breaks into" 30 + 2 Students then add the tens 40 + 30 = 70

and then add the ones 5 + 2 = 7 and then add the two sums together 77 ...... 45 + 32 = 77

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Q: What is the break apart strategy for addition and subtraction?
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