The simplified answer would be 3/10.
To find that answer, you would have to take 1/2 and 1/5 and find the LCD, which happens to be 10. Then, you would take your denominator of 10 and make 1/2 and 1/5 into equivalent fractions with denominators of 10. You must multiply the numerator by the LCD divided by the denominator, Which turns 1/2 into 5/10 and 1/5 into 2/10. Then you subtract 5/10-2/10 which is 3/10. Then you would simplify but there is no GCM for 3 and 10, so there you have your answer!
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minus one half
two and one half
15 and one half divided by 2 and one fifth = 7.5
One half is bigger.
12