Subtract 49/42 from 20/21
1st number: 20/21, 2nd number: 1 7/42
20/21 - 49/42 is -3/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
20/21 = 20 × 2/21 × 2 = 40/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
49/42 = 49 × 1/42 × 1 = 49/42 - Subtract the two like fractions:
40/42 - 49/42 = 40 - 49/42 = -9/42 - After reducing the fraction, the answer is -3/14
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