Subtract 25/8 from 4/81
1st number: 4/81, 2nd number: 3 1/8
4/81 - 25/8 is -1993/648.
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,
4/81 = 4 × 8/81 × 8 = 32/648 - Likewise, for the 2nd fraction, since 8 × 81 = 648,
25/8 = 25 × 81/8 × 81 = 2025/648 - Subtract the two like fractions:
32/648 - 2025/648 = 32 - 2025/648 = -1993/648
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/81-25/8 4/81-50/8 4/81-25/16 12/81-25/8 4/81-75/8 4/81-25/24 20/81-25/8 4/81-25/40 28/81-25/8 4/81-25/56