Subtract 35/7 from 21/54
1st number: 21/54, 2nd number: 5 0/7
21/54 - 35/7 is -83/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 7 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 54 × 7 = 378,
21/54 = 21 × 7/54 × 7 = 147/378 - Likewise, for the 2nd fraction, since 7 × 54 = 378,
35/7 = 35 × 54/7 × 54 = 1890/378 - Subtract the two like fractions:
147/378 - 1890/378 = 147 - 1890/378 = -1743/378 - After reducing the fraction, the answer is -83/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/54-35/7 21/54-70/7 21/54-35/14 63/54-35/7 21/54-35/21 21/54-35/49