Subtract 18/20 from 6/7
6/7 - 18/20 is -3/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 7 × 20 = 140,
6/7 = 6 × 20/7 × 20 = 120/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
18/20 = 18 × 7/20 × 7 = 126/140 - Subtract the two like fractions:
120/140 - 126/140 = 120 - 126/140 = -6/140 - After reducing the fraction, the answer is -3/70
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