find the lowest common denominator so both have the same denominator, then subtract the numerators only leaving the denominator the same
For example
1/2 - 1/4
2/4-1/4
= 1/4
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Find the lowest common denominator as for instance 3/4 minus 1/2 is the same as 3/4 minus 2/4 = 1/4
if the question u are asking is something like this 1/2 - ( - 1/2 ) then the answer is simple all you have to do is solve the equation like this 1/2 - ( - 1/2 ) = 1/2 + 1/2 = 2/2 = 1 its the - (-1/2) that is important remember the rule minus and minus equal plus plus and plus equal plus minus and plus equal minus remember and i hope it helps :)
6/7 - 2/3 = 18/21 - 14/21 = 4/21
0 over 6
18.5. You should get a calculator that can do fractions or use wolframalpha.com