Subtract 9/21 from 3/20
3/20 - 9/21 is -39/140.
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,
3/20 = 3 × 21/20 × 21 = 63/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
9/21 = 9 × 20/21 × 20 = 180/420 - Subtract the two like fractions:
63/420 - 180/420 = 63 - 180/420 = -117/420 - After reducing the fraction, the answer is -39/140
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