Subtract 28/8 from 15/81
1st number: 15/81, 2nd number: 3 4/8
15/81 - 28/8 is -179/54.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 8 is 648
Next, find the equivalent fraction of both fractional numbers with denominator 648 - For the 1st fraction, since 81 × 8 = 648,
15/81 = 15 × 8/81 × 8 = 120/648 - Likewise, for the 2nd fraction, since 8 × 81 = 648,
28/8 = 28 × 81/8 × 81 = 2268/648 - Subtract the two like fractions:
120/648 - 2268/648 = 120 - 2268/648 = -2148/648 - After reducing the fraction, the answer is -179/54
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/81-28/8 15/81-56/8 15/81-28/16 45/81-28/8 15/81-84/8 15/81-28/24 75/81-28/8 15/81-28/40 15/81-28/56