Subtract 21/18 from 20/42
1st number: 20/42, 2nd number: 1 3/18
20/42 - 21/18 is -29/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 42 × 3 = 126,
20/42 = 20 × 3/42 × 3 = 60/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
21/18 = 21 × 7/18 × 7 = 147/126 - Subtract the two like fractions:
60/126 - 147/126 = 60 - 147/126 = -87/126 - After reducing the fraction, the answer is -29/42
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