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27 May, 10:19

Add or subtract mentally 16.9 + 12.1

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Answers (2)
  1. 27 May, 10:38
    0
    When you add it mentally you'd get 29

    When you subtract it mentally you'd get 4.8
  2. 27 May, 13:34
    0
    Well, just add or subtract it form the back and work your way to the front, and you have to remember what the digit was.

    16.9 + 12.1 = 29

    16.9 - 12.1 = 4.8
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