Subtract 21/90 from 21/14
1st number: 1 7/14, 2nd number: 21/90
21/14 - 21/90 is 19/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 14 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 14 × 45 = 630,
21/14 = 21 × 45/14 × 45 = 945/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
21/90 = 21 × 7/90 × 7 = 147/630 - Subtract the two like fractions:
945/630 - 147/630 = 945 - 147/630 = 798/630 - After reducing the fraction, the answer is 19/15
- In mixed form: 14/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/14-21/90 21/14-42/90 21/28-21/90 63/14-21/90 21/14-63/90 21/42-21/90 21/70-21/90 21/98-21/90