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Schach [20]
4 years ago
12

Write an expression 13+ 19+ 17 using mental math

Mathematics
1 answer:
raketka [301]4 years ago
3 0

Explanation:

It is convenient to regroup the numbers, and adjust two of them to "make a ten".

  = 13 + 17 + 19 . . . . rearrange (swap the order of 17 and 19)

  = (10 + 3) + (-3 + 20) + 19 . . . . "make a ten" by adding or subtracting a small number. Here, those adjustments cancel—which is the point of doing it.

  = 10 + 20 + 19

  = 30 + 19

  = 49

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