Subtract 98/9 from 81/40
1st number: 2 1/40, 2nd number: 10 8/9
81/40 - 98/9 is -3191/360.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 9 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,
81/40 = 81 × 9/40 × 9 = 729/360 - Likewise, for the 2nd fraction, since 9 × 40 = 360,
98/9 = 98 × 40/9 × 40 = 3920/360 - Subtract the two like fractions:
729/360 - 3920/360 = 729 - 3920/360 = -3191/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/80-98/9 81/40-98/18 81/40-98/27 81/40-98/45 81/40-98/63