Subtract 6/21 from 49/90
49/90 - 6/21 is 163/630.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 21 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
49/90 = 49 × 7/90 × 7 = 343/630 - Likewise, for the 2nd fraction, since 21 × 30 = 630,
6/21 = 6 × 30/21 × 30 = 180/630 - Subtract the two like fractions:
343/630 - 180/630 = 343 - 180/630 = 163/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 98/90-6/21 49/90-12/21 49/90-6/42 49/90-18/21 49/90-6/63 49/90-30/21 49/90-42/21