Subtract 42/27 from 2/21
1st number: 2/21, 2nd number: 1 15/27
2/21 - 42/27 is -92/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 27 is 189
Next, find the equivalent fraction of both fractional numbers with denominator 189 - For the 1st fraction, since 21 × 9 = 189,
2/21 = 2 × 9/21 × 9 = 18/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
42/27 = 42 × 7/27 × 7 = 294/189 - Subtract the two like fractions:
18/189 - 294/189 = 18 - 294/189 = -276/189 - After reducing the fraction, the answer is -92/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/21-42/27 2/21-84/27 2/42-42/27 2/21-42/54 6/21-42/27 2/63-42/27 2/21-42/81 10/21-42/27 14/21-42/27