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28 September, 08:16

Use mental math to evaluate the expression 6 (31) + 6 (4) - 6 (15)

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Answers (2)
  1. 28 September, 08:30
    0
    Remember distributive property

    a (b+c) = ab+ac

    we can ervers it

    6 (31) + 6 (4) - 6 (15) = 6 (31) + 6 (4) + 6 (-15) = 6 (31+4-15) = 6 (20) = 120
  2. 28 September, 08:45
    0
    Okay this is how i did it,

    6 (31) + 6 (4) - 6 (15)

    186 + 24 - 90

    = 120
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