Subtract 81/80 from 3/10
1st number: 3/10, 2nd number: 1 1/80
3/10 - 81/80 is -57/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 10 × 8 = 80,
3/10 = 3 × 8/10 × 8 = 24/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
81/80 = 81 × 1/80 × 1 = 81/80 - Subtract the two like fractions:
24/80 - 81/80 = 24 - 81/80 = -57/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/10-81/80 3/20-81/80 9/10-81/80 3/30-81/80 15/10-81/80 3/50-81/80 21/10-81/80 3/70-81/80