Subtract 50/72 from 4/21
4/21 - 50/72 is -127/252.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 21 × 24 = 504,
4/21 = 4 × 24/21 × 24 = 96/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
50/72 = 50 × 7/72 × 7 = 350/504 - Subtract the two like fractions:
96/504 - 350/504 = 96 - 350/504 = -254/504 - After reducing the fraction, the answer is -127/252
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21-50/72 4/42-50/72 12/21-50/72 4/63-50/72 20/21-50/72 28/21-50/72