# Math

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Give reasons for each of the following steps:
16 + 31= ( 1. 10 + 6) + (3.10 + 1)
= ( 1. 10 + 3. 10) + (6 + 1)
= (1+ 3) 10 + (6+ 1)
= 4 .10 + 7
= 47

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