We can subtract them by making both fractions have common denominators or converting them into decimals then solving.
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Common denominators:
Multiply both the numerator and denominator of 1/2 by 5/5.
1/2 becomes 5/10.
Now you can subtract 7/10 - 5/10 = 2/10.
You can simplify 2/10 by dividing both sides by 2.
2/10 simplifies to 1/5.
Your answer is 1/5 (fraction form).
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Decimals:
7/10 is 0.7 as a decimal, and 1/2 is 0.5 as a decimal.
Now you can subtract both decimals.
0.7 - 0.5 = 0.2
Your answer is 0.2 (decimal form).
