Subtract 18/30 from 72/20
1st number: 3 12/20, 2nd number: 18/30
72/20 - 18/30 is 3/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 30 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 20 × 3 = 60,
72/20 = 72 × 3/20 × 3 = 216/60 - Likewise, for the 2nd fraction, since 30 × 2 = 60,
18/30 = 18 × 2/30 × 2 = 36/60 - Subtract the two like fractions:
216/60 - 36/60 = 216 - 36/60 = 180/60 - After reducing the fraction, the answer is 3/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/20-36/30 72/40-18/30 72/20-18/60 72/20-54/30 72/60-18/30 72/20-18/90 72/20-90/30