Subtract 7/21 from 21/98
21/98 - 7/21 is -5/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 98 and 21 is 294
Next, find the equivalent fraction of both fractional numbers with denominator 294 - For the 1st fraction, since 98 × 3 = 294,
21/98 = 21 × 3/98 × 3 = 63/294 - Likewise, for the 2nd fraction, since 21 × 14 = 294,
7/21 = 7 × 14/21 × 14 = 98/294 - Subtract the two like fractions:
63/294 - 98/294 = 63 - 98/294 = -35/294 - After reducing the fraction, the answer is -5/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/98-7/21 21/98-14/21 21/98-7/42 63/98-7/21 21/98-7/63 21/98-35/21 21/98-49/21