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