Subtract 18/72 from 12/8
1st number: 1 4/8, 2nd number: 18/72
12/8 - 18/72 is 5/4.
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,
18/72 = 18 × 1/72 × 1 = 18/72 - Subtract the two like fractions:
108/72 - 18/72 = 108 - 18/72 = 90/72 - After reducing the fraction, the answer is 5/4
- In mixed form: 11/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/8-18/72 12/8-36/72 12/16-18/72 36/8-18/72 12/8-54/72 12/24-18/72 60/8-18/72 12/8-90/72 12/40-18/72 84/8-18/72 12/56-18/72