Subtract 30/81 from 15/8
1st number: 1 7/8, 2nd number: 30/81
15/8 - 30/81 is 325/216.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 81 is 648
Next, find the equivalent fraction of both fractional numbers with denominator 648 - For the 1st fraction, since 8 × 81 = 648,
15/8 = 15 × 81/8 × 81 = 1215/648 - Likewise, for the 2nd fraction, since 81 × 8 = 648,
30/81 = 30 × 8/81 × 8 = 240/648 - Subtract the two like fractions:
1215/648 - 240/648 = 1215 - 240/648 = 975/648 - After reducing the fraction, the answer is 325/216
- In mixed form: 1109/216
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/8-30/81 15/8-60/81 15/16-30/81 45/8-30/81 15/8-90/81 15/24-30/81 75/8-30/81 15/40-30/81 15/56-30/81