Subtract 2/90 from 21/18
1st number: 1 3/18, 2nd number: 2/90
21/18 - 2/90 is 103/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
21/18 = 21 × 5/18 × 5 = 105/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
2/90 = 2 × 1/90 × 1 = 2/90 - Subtract the two like fractions:
105/90 - 2/90 = 105 - 2/90 = 103/90 - In mixed form: 113/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18-2/90 21/18-4/90 21/36-2/90 63/18-2/90 21/18-6/90 21/54-2/90 21/18-10/90 21/90-2/90 21/18-14/90