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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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What is the break apart strategy for subtraction?

The break apart strategy for subtraction involves breaking down the numbers being subtracted into easier-to-manage parts. This can involve rounding to the nearest multiple of ten or hundred, subtracting parts separately, and then combining the results to find the final answer.


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To break apart 4x7, you can use the distributive property of multiplication over addition. This means you can break apart the multiplication into smaller, more manageable parts. For example, you can break apart 4x7 into (4x5) + (4x2), which equals 20 + 8, resulting in a final answer of 28.


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