Subtract 20/42 from 6/36
6/36 - 20/42 is -13/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 42 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 36 × 7 = 252,
6/36 = 6 × 7/36 × 7 = 42/252 - Likewise, for the 2nd fraction, since 42 × 6 = 252,
20/42 = 20 × 6/42 × 6 = 120/252 - Subtract the two like fractions:
42/252 - 120/252 = 42 - 120/252 = -78/252 - After reducing the fraction, the answer is -13/42
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