Subtract 9/12 from 18/90
18/90 - 9/12 is -11/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 12 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
18/90 = 18 × 2/90 × 2 = 36/180 - Likewise, for the 2nd fraction, since 12 × 15 = 180,
9/12 = 9 × 15/12 × 15 = 135/180 - Subtract the two like fractions:
36/180 - 135/180 = 36 - 135/180 = -99/180 - After reducing the fraction, the answer is -11/20
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