Subtract 21/90 from 8/14
8/14 - 21/90 is 71/210.
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,
8/14 = 8 × 45/14 × 45 = 360/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
21/90 = 21 × 7/90 × 7 = 147/630 - Subtract the two like fractions:
360/630 - 147/630 = 360 - 147/630 = 213/630 - After reducing the fraction, the answer is 71/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/14-21/90 8/14-42/90 8/28-21/90 24/14-21/90 8/14-63/90 8/42-21/90 40/14-21/90 8/70-21/90 56/14-21/90 8/98-21/90