Subtract 90/72 from 10/28
1st number: 10/28, 2nd number: 1 18/72
10/28 - 90/72 is -25/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 28 × 18 = 504,
10/28 = 10 × 18/28 × 18 = 180/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
90/72 = 90 × 7/72 × 7 = 630/504 - Subtract the two like fractions:
180/504 - 630/504 = 180 - 630/504 = -450/504 - After reducing the fraction, the answer is -25/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/28-90/72 10/56-90/72 30/28-90/72 10/84-90/72 50/28-90/72 70/28-90/72