Subtract 18/90 from 4/7
4/7 - 18/90 is 13/35.
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,
18/90 = 18 × 7/90 × 7 = 126/630 - Subtract the two like fractions:
360/630 - 126/630 = 360 - 126/630 = 234/630 - After reducing the fraction, the answer is 13/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/7-18/90 4/7-36/90 4/14-18/90 12/7-18/90 4/7-54/90 4/21-18/90 20/7-18/90 4/35-18/90 28/7-18/90 4/49-18/90