Subtract 7/90 from 3/7
3/7 - 7/90 is 221/630.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 7 × 90 = 630,
3/7 = 3 × 90/7 × 90 = 270/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
7/90 = 7 × 7/90 × 7 = 49/630 - Subtract the two like fractions:
270/630 - 49/630 = 270 - 49/630 = 221/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/7-7/90 3/7-14/90 3/14-7/90 9/7-7/90 3/7-21/90 3/21-7/90 15/7-7/90 3/7-35/90 3/35-7/90 21/7-7/90 3/7-49/90 3/49-7/90