Subtract 21/5 from 72/4
1st number: 18 0/4, 2nd number: 4 1/5
72/4 - 21/5 is 69/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 5 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 4 × 5 = 20,
72/4 = 72 × 5/4 × 5 = 360/20 - Likewise, for the 2nd fraction, since 5 × 4 = 20,
21/5 = 21 × 4/5 × 4 = 84/20 - Subtract the two like fractions:
360/20 - 84/20 = 360 - 84/20 = 276/20 - After reducing the fraction, the answer is 69/5
- In mixed form: 134/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/4-42/5 72/8-21/5 72/4-21/10 72/4-63/5 72/12-21/5 72/4-21/15 72/20-21/5 72/4-21/25 72/28-21/5 72/4-21/35