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4 January, 17:44

Shelley spent 17 minutes washing dishes. She spent 38 minutes cleaning her room. Explain how you can use mental math to find how long Shelley spent on the two tasks.

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Answers (2)
  1. 4 January, 18:54
    0
    All you need to do is round up 17 and 38 to 20 and 40 in your head. Solve for that in your head and then subtract 5 from the sum.

    20+40=60

    60-5+55
  2. 4 January, 20:37
    0
    17 + 38 your add both numbers. and you get 55
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