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9 October, 11:45

Reasoning: if you know that 9 x 20 = 180, how can you use this to find 9 x 24? explain your strategy.

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  1. 9 October, 11:49
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    9 * 24 = 9 * (20 + 4) = 9 * 20 + 9 * 4 = 180 + 36 = 216;
  2. 9 October, 12:00
    0
    9 * 20 = 180

    24 has 4 more than that, so multiply 9 to 4 and add it to 180.

    9 * 4 = 36

    180 + 36 = 216

    So 9 * 24 = 216
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