To subtract fractions, the denominators (bottom numbers) must be equal; so first convert the fractions into equivalent fractions with the same denominator. Then the numerators (top numbers) are subtracted and the resulting fraction simplified:
9/18 - 3/9 = 9/18 - 6/18
= 3/18
= 1/6
3 minus 3/18 is 2 5/6
Well, darling, 17 over 18 minus 2 over 3 is the same as 17 times 3 minus 2 times 18, all over 18 times 3. So, that gives you 51 minus 36 over 54, which simplifies to 15 over 54, or 5 over 18. Math doesn't have to be a drag, honey!
3/18
1 over 2
14/20 minus 3/5 is 1/10
14
0.27
It is -25/36
17/18
it is 2 over 4
Converting to twentieths, we get 8 over 20 minus 15 over 20, resulting in minus 7 over 20.
-3/8