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Shkiper50 [21]
3 years ago
14

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.
Mathematics
2 answers:
Gemiola [76]3 years ago
7 0
17 + 38 your add both numbers. and you get 55
dalvyx [7]3 years ago
4 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
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