Subtract 3/20 from 21/90
21/90 - 3/20 is 1/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
21/90 = 21 × 2/90 × 2 = 42/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
3/20 = 3 × 9/20 × 9 = 27/180 - Subtract the two like fractions:
42/180 - 27/180 = 42 - 27/180 = 15/180 - After reducing the fraction, the answer is 1/12
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