Subtract 4/7 from 90/72
1st number: 1 18/72, 2nd number: 4/7
90/72 - 4/7 is 19/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 7 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 72 × 7 = 504,
90/72 = 90 × 7/72 × 7 = 630/504 - Likewise, for the 2nd fraction, since 7 × 72 = 504,
4/7 = 4 × 72/7 × 72 = 288/504 - Subtract the two like fractions:
630/504 - 288/504 = 630 - 288/504 = 342/504 - After reducing the fraction, the answer is 19/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/72-8/7 90/72-4/14 90/72-12/7 90/72-4/21 90/72-20/7 90/72-4/35 90/72-28/7 90/72-4/49