Question

Simplify using mental math 7 / 10 + 2 / 5 - 1 / 10

Answer 1

Assuming mental math still follows the order of operations, you have

`(7)/(10) + (4)/(10) - (1)/(10) = (10)/(10) = 1`

So the answer is 1.

Answer 2

common denominator first. multiply 2/5 by 2 in the top and bottom so they all have a denominator of 10

7/10+4/10-1/10=10/10

10/10=1