Subtract 15/72 from 90/28
1st number: 3 6/28, 2nd number: 15/72
90/28 - 15/72 is 505/168.
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,
90/28 = 90 × 18/28 × 18 = 1620/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
15/72 = 15 × 7/72 × 7 = 105/504 - Subtract the two like fractions:
1620/504 - 105/504 = 1620 - 105/504 = 1515/504 - After reducing the fraction, the answer is 505/168
- In mixed form: 31/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/28-30/72 90/56-15/72 90/28-45/72 90/84-15/72 90/28-75/72