Subtract 28/18 from 20/42
1st number: 20/42, 2nd number: 1 10/18
20/42 - 28/18 is -68/63.
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,
28/18 = 28 × 7/18 × 7 = 196/126 - Subtract the two like fractions:
60/126 - 196/126 = 60 - 196/126 = -136/126 - After reducing the fraction, the answer is -68/63
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