Subtract 3/20 from 72/30
1st number: 2 12/30, 2nd number: 3/20
72/30 - 3/20 is 9/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 20 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 20 × 3 = 60,
3/20 = 3 × 3/20 × 3 = 9/60 - Subtract the two like fractions:
144/60 - 9/60 = 144 - 9/60 = 135/60 - After reducing the fraction, the answer is 9/4
- In mixed form: 21/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/30-6/20 72/60-3/20 72/30-3/40 72/30-9/20 72/90-3/20 72/30-3/60 72/30-15/20 72/30-21/20