Subtract 7/20 from 14/42
14/42 - 7/20 is -1/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 42 × 10 = 420,
14/42 = 14 × 10/42 × 10 = 140/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
7/20 = 7 × 21/20 × 21 = 147/420 - Subtract the two like fractions:
140/420 - 147/420 = 140 - 147/420 = -7/420 - After reducing the fraction, the answer is -1/60
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