Subtract 21/72 from 9/4
1st number: 2 1/4, 2nd number: 21/72
9/4 - 21/72 is 47/24.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 72 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 4 × 18 = 72,
9/4 = 9 × 18/4 × 18 = 162/72 - Likewise, for the 2nd fraction, since 72 × 1 = 72,
21/72 = 21 × 1/72 × 1 = 21/72 - Subtract the two like fractions:
162/72 - 21/72 = 162 - 21/72 = 141/72 - After reducing the fraction, the answer is 47/24
- In mixed form: 123/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/4-21/72 9/4-42/72 9/8-21/72 27/4-21/72 9/4-63/72 9/12-21/72 45/4-21/72 9/20-21/72 63/4-21/72 9/28-21/72