Subtract 30/20 from 72/40
1st number: 1 32/40, 2nd number: 1 10/20
72/40 - 30/20 is 3/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 20 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 40 × 1 = 40,
72/40 = 72 × 1/40 × 1 = 72/40 - Likewise, for the 2nd fraction, since 20 × 2 = 40,
30/20 = 30 × 2/20 × 2 = 60/40 - Subtract the two like fractions:
72/40 - 60/40 = 72 - 60/40 = 12/40 - After reducing the fraction, the answer is 3/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/40-60/20 72/80-30/20 72/40-30/40 72/40-90/20 72/40-30/60