Does 65 - (45-20) equal (65-45) - 20? how do you know?

Question

Jacqueline Phelps

Mathematics

17 April, 17:50

Does 65 - (45-20) equal (65-45) - 20? how do you know?

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Derick Wolfe · Answer 1

No, it does not. 65 - (45-20) is equal to 40, because you subtract 45-20 before because of the parentheses. When you do that, you get 25 then subtract 65-25, then get 40. Then, if you subtract 65-45 first and get 25, then subtract 25-20, you'll get 5.