Subtract 81/10 from 28/18
1st number: 1 10/18, 2nd number: 8 1/10
28/18 - 81/10 is -589/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 10 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
28/18 = 28 × 5/18 × 5 = 140/90 - Likewise, for the 2nd fraction, since 10 × 9 = 90,
81/10 = 81 × 9/10 × 9 = 729/90 - Subtract the two like fractions:
140/90 - 729/90 = 140 - 729/90 = -589/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/18-81/10 28/36-81/10 28/18-81/20 84/18-81/10 28/54-81/10 28/18-81/30 28/90-81/10 28/18-81/50 28/18-81/70