Subtract 20/72 from 12/8
1st number: 1 4/8, 2nd number: 20/72
12/8 - 20/72 is 11/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 72 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 8 × 9 = 72,
12/8 = 12 × 9/8 × 9 = 108/72 - Likewise, for the 2nd fraction, since 72 × 1 = 72,
20/72 = 20 × 1/72 × 1 = 20/72 - Subtract the two like fractions:
108/72 - 20/72 = 108 - 20/72 = 88/72 - After reducing the fraction, the answer is 11/9
- In mixed form: 12/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/8-20/72 12/8-40/72 12/16-20/72 36/8-20/72 12/8-60/72 12/24-20/72 60/8-20/72 12/40-20/72 84/8-20/72 12/56-20/72