Subtract 35/7 from 21/28
1st number: 21/28, 2nd number: 5 0/7
21/28 - 35/7 is -17/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 7 is 28
Next, find the equivalent fraction of both fractional numbers with denominator 28 - For the 1st fraction, since 28 × 1 = 28,
21/28 = 21 × 1/28 × 1 = 21/28 - Likewise, for the 2nd fraction, since 7 × 4 = 28,
35/7 = 35 × 4/7 × 4 = 140/28 - Subtract the two like fractions:
21/28 - 140/28 = 21 - 140/28 = -119/28 - After reducing the fraction, the answer is -17/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28-35/7 21/28-70/7 21/56-35/7 21/28-35/14 63/28-35/7 21/84-35/7 21/28-35/21 21/28-35/49