shelley spent 17 min washing the dishes. she spent 38 min cleaning her room. explain how you can use mental math to find how long shelley spent on the two tasks?

Answer 1

I would add 15 to 40

Answer 2

can you can why? detailed please

Answer 3

can you explain why?

Answer 4

17 - 2 + 2 + 38

= 15 + 40