Subtract 80/21 from 50/72
1st number: 50/72, 2nd number: 3 17/21
50/72 - 80/21 is -785/252.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 21 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 72 × 7 = 504,
50/72 = 50 × 7/72 × 7 = 350/504 - Likewise, for the 2nd fraction, since 21 × 24 = 504,
80/21 = 80 × 24/21 × 24 = 1920/504 - Subtract the two like fractions:
350/504 - 1920/504 = 350 - 1920/504 = -1570/504 - After reducing the fraction, the answer is -785/252
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/72-80/42 50/72-80/63