50
what's "mental math" supposed to mean?
if it just means you did it in your head, then there is no difference between mental and regular math, except that it is harder to check your work.
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5
5x2=10...take 5 two times..5+5=10
The answer to the math problem of 7/10 times 5 is 7/2. The answer to this in decimal form is 3.5.
Well, darling, 10 times 5 is a piece of cake. It's 50, honey. Simple math, no need to make it complicated.
The answer is 50.