Subtract 64/49 from 21/28
1st number: 21/28, 2nd number: 1 15/49
21/28 - 64/49 is -109/196.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 49 is 196
Next, find the equivalent fraction of both fractional numbers with denominator 196 - For the 1st fraction, since 28 × 7 = 196,
21/28 = 21 × 7/28 × 7 = 147/196 - Likewise, for the 2nd fraction, since 49 × 4 = 196,
64/49 = 64 × 4/49 × 4 = 256/196 - Subtract the two like fractions:
147/196 - 256/196 = 147 - 256/196 = -109/196
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28-64/49 21/56-64/49 21/28-64/98 63/28-64/49 21/84-64/49