Subtract 2/18 from 21/15
1st number: 1 6/15, 2nd number: 2/18
21/15 - 2/18 is 58/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 15 × 6 = 90,
21/15 = 21 × 6/15 × 6 = 126/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
2/18 = 2 × 5/18 × 5 = 10/90 - Subtract the two like fractions:
126/90 - 10/90 = 126 - 10/90 = 116/90 - After reducing the fraction, the answer is 58/45
- In mixed form: 113/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15-2/18 21/15-4/18 21/30-2/18 21/15-2/36 63/15-2/18 21/15-6/18 21/45-2/18 21/15-2/54 21/15-10/18 21/75-2/18 21/15-2/90 21/15-14/18