Subtract 81/80 from 8/15
1st number: 8/15, 2nd number: 1 1/80
8/15 - 81/80 is -23/48.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 80 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 15 × 16 = 240,
8/15 = 8 × 16/15 × 16 = 128/240 - Likewise, for the 2nd fraction, since 80 × 3 = 240,
81/80 = 81 × 3/80 × 3 = 243/240 - Subtract the two like fractions:
128/240 - 243/240 = 128 - 243/240 = -115/240 - After reducing the fraction, the answer is -23/48
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/15-81/80 8/30-81/80 24/15-81/80 8/45-81/80 40/15-81/80 8/75-81/80 56/15-81/80