Subtract 21/28 from 72/4
1st number: 18 0/4, 2nd number: 21/28
72/4 - 21/28 is 69/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 28 is 28
Next, find the equivalent fraction of both fractional numbers with denominator 28 - For the 1st fraction, since 4 × 7 = 28,
72/4 = 72 × 7/4 × 7 = 504/28 - Likewise, for the 2nd fraction, since 28 × 1 = 28,
21/28 = 21 × 1/28 × 1 = 21/28 - Subtract the two like fractions:
504/28 - 21/28 = 504 - 21/28 = 483/28 - After reducing the fraction, the answer is 69/4
- In mixed form: 171/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/4-42/28 72/8-21/28 72/4-21/56 72/4-63/28 72/12-21/28 72/4-21/84 72/20-21/28 72/28-21/28