Subtract 50/20 from 72/21
1st number: 3 9/21, 2nd number: 2 10/20
72/21 - 50/20 is 13/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
72/21 = 72 × 20/21 × 20 = 1440/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
50/20 = 50 × 21/20 × 21 = 1050/420 - Subtract the two like fractions:
1440/420 - 1050/420 = 1440 - 1050/420 = 390/420 - After reducing the fraction, the answer is 13/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/42-50/20 72/21-50/40 72/63-50/20 72/21-50/60