Subtract 21/90 from 14/21
14/21 - 21/90 is 13/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 21 × 30 = 630,
14/21 = 14 × 30/21 × 30 = 420/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
21/90 = 21 × 7/90 × 7 = 147/630 - Subtract the two like fractions:
420/630 - 147/630 = 420 - 147/630 = 273/630 - After reducing the fraction, the answer is 13/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 28/21-21/90 14/21-42/90 14/42-21/90 42/21-21/90 14/21-63/90 14/63-21/90 70/21-21/90 98/21-21/90