Subtract 81/80 from 40/60
1st number: 40/60, 2nd number: 1 1/80
40/60 - 81/80 is -83/240.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 80 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 60 × 4 = 240,
40/60 = 40 × 4/60 × 4 = 160/240 - Likewise, for the 2nd fraction, since 80 × 3 = 240,
81/80 = 81 × 3/80 × 3 = 243/240 - Subtract the two like fractions:
160/240 - 243/240 = 160 - 243/240 = -83/240
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/60-81/80