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27 August, 03:46

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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  1. 27 August, 04:38
    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. 27 August, 07:03
    0
    17 + 38 your add both numbers. and you get 55
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