Subtract 12/20 from 8/21
8/21 - 12/20 is -23/105.
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,
8/21 = 8 × 20/21 × 20 = 160/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
12/20 = 12 × 21/20 × 21 = 252/420 - Subtract the two like fractions:
160/420 - 252/420 = 160 - 252/420 = -92/420 - After reducing the fraction, the answer is -23/105
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