Subtract 70/49 from 21/28
1st number: 21/28, 2nd number: 1 21/49
21/28 - 70/49 is -19/28.
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,
70/49 = 70 × 4/49 × 4 = 280/196 - Subtract the two like fractions:
147/196 - 280/196 = 147 - 280/196 = -133/196 - After reducing the fraction, the answer is -19/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28-70/49 21/56-70/49 21/28-70/98 63/28-70/49 21/84-70/49