Subtract 20/7 from 49/90
1st number: 49/90, 2nd number: 2 6/7
49/90 - 20/7 is -1457/630.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 7 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 7 × 90 = 630,
20/7 = 20 × 90/7 × 90 = 1800/630 - Subtract the two like fractions:
343/630 - 1800/630 = 343 - 1800/630 = -1457/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 98/90-20/7 49/90-40/7 49/90-20/14 49/90-60/7 49/90-20/21 49/90-20/35 49/90-20/49