Subtract 18/7 from 12/20
1st number: 12/20, 2nd number: 2 4/7
12/20 - 18/7 is -69/35.
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,
12/20 = 12 × 7/20 × 7 = 84/140 - Likewise, for the 2nd fraction, since 7 × 20 = 140,
18/7 = 18 × 20/7 × 20 = 360/140 - Subtract the two like fractions:
84/140 - 360/140 = 84 - 360/140 = -276/140 - After reducing the fraction, the answer is -69/35
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