Subtract 81/8 from 12/72
1st number: 12/72, 2nd number: 10 1/8
12/72 - 81/8 is -239/24.
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,
12/72 = 12 × 1/72 × 1 = 12/72 - Likewise, for the 2nd fraction, since 8 × 9 = 72,
81/8 = 81 × 9/8 × 9 = 729/72 - Subtract the two like fractions:
12/72 - 729/72 = 12 - 729/72 = -717/72 - After reducing the fraction, the answer is -239/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/72-81/8 12/72-81/16 36/72-81/8 12/72-81/24 60/72-81/8 12/72-81/40 84/72-81/8 12/72-81/56