Subtract 90/20 from 16/21
1st number: 16/21, 2nd number: 4 10/20
16/21 - 90/20 is -157/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
16/21 = 16 × 20/21 × 20 = 320/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
90/20 = 90 × 21/20 × 21 = 1890/420 - Subtract the two like fractions:
320/420 - 1890/420 = 320 - 1890/420 = -1570/420 - After reducing the fraction, the answer is -157/42
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