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

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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.
User MeatPopsicle
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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
User Rra
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