Subtract 21/90 from 12/14
12/14 - 21/90 is 131/210.
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,
12/14 = 12 × 45/14 × 45 = 540/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
21/90 = 21 × 7/90 × 7 = 147/630 - Subtract the two like fractions:
540/630 - 147/630 = 540 - 147/630 = 393/630 - After reducing the fraction, the answer is 131/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/14-21/90 12/14-42/90 12/28-21/90 36/14-21/90 12/14-63/90 12/42-21/90 60/14-21/90 12/70-21/90 84/14-21/90 12/98-21/90