Subtract 42/20 from 12/7
1st number: 1 5/7, 2nd number: 2 2/20
12/7 - 42/20 is -27/70.
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,
12/7 = 12 × 20/7 × 20 = 240/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
42/20 = 42 × 7/20 × 7 = 294/140 - Subtract the two like fractions:
240/140 - 294/140 = 240 - 294/140 = -54/140 - After reducing the fraction, the answer is -27/70
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