Subtract 21/12 from 72/30
1st number: 2 12/30, 2nd number: 1 9/12
72/30 - 21/12 is 13/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 12 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 30 × 2 = 60,
72/30 = 72 × 2/30 × 2 = 144/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
21/12 = 21 × 5/12 × 5 = 105/60 - Subtract the two like fractions:
144/60 - 105/60 = 144 - 105/60 = 39/60 - After reducing the fraction, the answer is 13/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/30-42/12 72/60-21/12 72/30-21/24 72/30-63/12 72/90-21/12 72/30-21/36 72/30-21/60 72/30-21/84