Subtract 98/7 from 21/30
1st number: 21/30, 2nd number: 14 0/7
21/30 - 98/7 is -133/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 7 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
21/30 = 21 × 7/30 × 7 = 147/210 - Likewise, for the 2nd fraction, since 7 × 30 = 210,
98/7 = 98 × 30/7 × 30 = 2940/210 - Subtract the two like fractions:
147/210 - 2940/210 = 147 - 2940/210 = -2793/210 - After reducing the fraction, the answer is -133/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30-98/7 21/60-98/7 21/30-98/14 63/30-98/7 21/90-98/7 21/30-98/21 21/30-98/35 21/30-98/49