Mental math

Algebra Level 1

21 + 2 + 4 + 8 + 17 = ? \large{21+2+4+8+17=?}

Note: Try not to use a calculator.


The answer is 52.

A Former Brilliant Member by A Former Brilliant Member

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1 solution

Edwin Gray
Sep 6, 2018

Someone has to do it. Combine 21 +4 =25 with8 + 17 = 25. then we have 25*2 + 2 = 52. Ed Gray

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i just added them straight through, left to right

Luke Gabriel Balgan - 2 years, 7 months ago

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