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Today, 16:25

Select the proper placement for parentheses to speed up the addition for the expression 4 + 6 + 5 A. (4 + 6) + 5 B. (5 + 6) + 4 C. 4 + (6 + 5) D. (5 + 4) + 6

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  1. Today, 16:40
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    I think it's A. Because 6+4 is 10 + 5 it would be 15
  2. Today, 17:09
    0
    I believe it should be A, because it's easier to add 10 to anything rather than 11 or 9.
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