Subtract 7/90 from 4/7
4/7 - 7/90 is 311/630.
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,
4/7 = 4 × 90/7 × 90 = 360/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
7/90 = 7 × 7/90 × 7 = 49/630 - Subtract the two like fractions:
360/630 - 49/630 = 360 - 49/630 = 311/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/7-7/90 4/7-14/90 4/14-7/90 12/7-7/90 4/7-21/90 4/21-7/90 20/7-7/90 4/7-35/90 4/35-7/90 28/7-7/90 4/7-49/90 4/49-7/90