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Need help solving the following problems.

Explain how you can find the difference 120-70 using mental math. Then name the difference.

Write two equations that prove the Associative Property is not true for subtraction.

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Solution Summary

This posting contains the solution to the given problems. The expert examines mental mathematics and associative properties explained.

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Hi,

Using mental math, we can easily perform 120-70 by mentally removing the zeroes at the ones digit to get 12-7. This is ...

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