Subtract 28/30 from 12/90
12/90 - 28/30 is -4/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 30 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 90 × 1 = 90,
12/90 = 12 × 1/90 × 1 = 12/90 - Likewise, for the 2nd fraction, since 30 × 3 = 90,
28/30 = 28 × 3/30 × 3 = 84/90 - Subtract the two like fractions:
12/90 - 84/90 = 12 - 84/90 = -72/90 - After reducing the fraction, the answer is -4/5
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