Subtract 9/80 from 72/20
1st number: 3 12/20, 2nd number: 9/80
72/20 - 9/80 is 279/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 20 × 4 = 80,
72/20 = 72 × 4/20 × 4 = 288/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
9/80 = 9 × 1/80 × 1 = 9/80 - Subtract the two like fractions:
288/80 - 9/80 = 288 - 9/80 = 279/80 - In mixed form: 339/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/20-18/80 72/40-9/80 72/20-27/80 72/60-9/80 72/20-45/80 72/20-63/80