Subtract 98/7 from 21/18
1st number: 1 3/18, 2nd number: 14 0/7
21/18 - 98/7 is -77/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 7 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
21/18 = 21 × 7/18 × 7 = 147/126 - Likewise, for the 2nd fraction, since 7 × 18 = 126,
98/7 = 98 × 18/7 × 18 = 1764/126 - Subtract the two like fractions:
147/126 - 1764/126 = 147 - 1764/126 = -1617/126 - After reducing the fraction, the answer is -77/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18-98/7 21/36-98/7 21/18-98/14 63/18-98/7 21/54-98/7 21/18-98/21 21/90-98/7 21/18-98/35 21/18-98/49