Subtract 21/72 from 30/12
1st number: 2 6/12, 2nd number: 21/72
30/12 - 21/72 is 53/24.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 72 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 12 × 6 = 72,
30/12 = 30 × 6/12 × 6 = 180/72 - Likewise, for the 2nd fraction, since 72 × 1 = 72,
21/72 = 21 × 1/72 × 1 = 21/72 - Subtract the two like fractions:
180/72 - 21/72 = 180 - 21/72 = 159/72 - After reducing the fraction, the answer is 53/24
- In mixed form: 25/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/12-21/72 30/12-42/72 30/24-21/72 90/12-21/72 30/12-63/72 30/36-21/72 30/60-21/72 30/84-21/72