Subtract 98/80 from 28/21
1st number: 1 7/21, 2nd number: 1 18/80
28/21 - 98/80 is 13/120.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 21 × 80 = 1680,
28/21 = 28 × 80/21 × 80 = 2240/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
98/80 = 98 × 21/80 × 21 = 2058/1680 - Subtract the two like fractions:
2240/1680 - 2058/1680 = 2240 - 2058/1680 = 182/1680 - After reducing the fraction, the answer is 13/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/21-98/80 28/42-98/80 84/21-98/80 28/63-98/80