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6 January, 19:46

Katie knew that 70 + 70 = 140. Explain how she can use this double to solve 70 + 80.

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Answers (2)
  1. 6 January, 19:54
    0
    see below

    Step-by-step explanation:

    70 + 70 = 140.

    We know that 80 is 10 more than 70

    the answer to 70+80 must be 10 more than the answer to 70+70 = 140

    so 140+10 = 150
  2. 6 January, 22:27
    0
    you would just add 10 to 140
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