Subtract 35/21 from 27/42
1st number: 27/42, 2nd number: 1 14/21
27/42 - 35/21 is -43/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
27/42 = 27 × 1/42 × 1 = 27/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
35/21 = 35 × 2/21 × 2 = 70/42 - Subtract the two like fractions:
27/42 - 70/42 = 27 - 70/42 = -43/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/42-35/21 27/42-70/21 27/84-35/21 27/42-35/42 81/42-35/21 27/42-35/63