Simplify using mental math 7 / 10 + 2 / 5 - 1 / 10
common denominator first. multiply 2/5 by 2 in the top and bottom so they all have a denominator of 107/10+4/10-1/10=10/1010/10=1
Assuming mental math still follows the order of operations, you have\(\frac{7}{10} + \frac{4}{10} - \frac{1}{10} = \frac{10}{10} = 1\)So the answer is 1.
