Subtract 20/49 from 1/42
1/42 - 20/49 is -113/294.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 49 is 294
Next, find the equivalent fraction of both fractional numbers with denominator 294 - For the 1st fraction, since 42 × 7 = 294,
1/42 = 1 × 7/42 × 7 = 7/294 - Likewise, for the 2nd fraction, since 49 × 6 = 294,
20/49 = 20 × 6/49 × 6 = 120/294 - Subtract the two like fractions:
7/294 - 120/294 = 7 - 120/294 = -113/294
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