Subtract 8/90 from 6/21
6/21 - 8/90 is 62/315.
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,
6/21 = 6 × 30/21 × 30 = 180/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
8/90 = 8 × 7/90 × 7 = 56/630 - Subtract the two like fractions:
180/630 - 56/630 = 180 - 56/630 = 124/630 - After reducing the fraction, the answer is 62/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/21-8/90 6/21-16/90 6/42-8/90 18/21-8/90 6/21-24/90 6/63-8/90 30/21-8/90 6/21-40/90 42/21-8/90 6/21-56/90