Subtract 18/63 from 90/72
1st number: 1 18/72, 2nd number: 18/63
90/72 - 18/63 is 27/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 63 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 63 × 8 = 504,
18/63 = 18 × 8/63 × 8 = 144/504 - Subtract the two like fractions:
630/504 - 144/504 = 630 - 144/504 = 486/504 - After reducing the fraction, the answer is 27/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/72-36/63 90/72-54/63 90/72-90/63