Subtract 75/7 from 18/20
1st number: 18/20, 2nd number: 10 5/7
18/20 - 75/7 is -687/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 7 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
18/20 = 18 × 7/20 × 7 = 126/140 - Likewise, for the 2nd fraction, since 7 × 20 = 140,
75/7 = 75 × 20/7 × 20 = 1500/140 - Subtract the two like fractions:
126/140 - 1500/140 = 126 - 1500/140 = -1374/140 - After reducing the fraction, the answer is -687/70
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