Subtract 15/21 from 1/20
1/20 - 15/21 is -93/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
1/20 = 1 × 21/20 × 21 = 21/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
15/21 = 15 × 20/21 × 20 = 300/420 - Subtract the two like fractions:
21/420 - 300/420 = 21 - 300/420 = -279/420 - After reducing the fraction, the answer is -93/140
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