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27 October, 02:31

Explain 81-16 in mental math

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Answers (2)
  1. 27 October, 02:53
    0
    we have

    (81-16)

    One way to use mental math is to add 4 to both 81 and 16

    so

    81+4=85/ / 16+4=20/ / 85-20=65

    therefore

    81-16=65

    the answer is

    65
  2. 27 October, 03:16
    0
    65 See below

    Step-by-step explanation:

    when doing mental math you need to break it apart to more manageable chunks.

    I would think of this as 70 and 11 - 6 = 75 then subtract 10 = 65
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