Subtract 5/7 from 7/90
7/90 - 5/7 is -401/630.
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,
7/90 = 7 × 7/90 × 7 = 49/630 - Likewise, for the 2nd fraction, since 7 × 90 = 630,
5/7 = 5 × 90/7 × 90 = 450/630 - Subtract the two like fractions:
49/630 - 450/630 = 49 - 450/630 = -401/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/90-5/7 7/90-10/7 7/90-5/14 21/90-5/7 7/90-15/7 7/90-5/21 35/90-5/7 7/90-25/7 7/90-5/35 49/90-5/7 7/90-35/7 7/90-5/49