Subtract 98/10 from 70/21
1st number: 3 7/21, 2nd number: 9 8/10
70/21 - 98/10 is -97/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
70/21 = 70 × 10/21 × 10 = 700/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
98/10 = 98 × 21/10 × 21 = 2058/210 - Subtract the two like fractions:
700/210 - 2058/210 = 700 - 2058/210 = -1358/210 - After reducing the fraction, the answer is -97/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/42-98/10 70/21-98/20 70/63-98/10 70/21-98/30 70/21-98/50 70/21-98/70