Subtract 81/80 from 80/84
1st number: 80/84, 2nd number: 1 1/80
80/84 - 81/80 is -101/1680.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 84 × 20 = 1680,
80/84 = 80 × 20/84 × 20 = 1600/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
81/80 = 81 × 21/80 × 21 = 1701/1680 - Subtract the two like fractions:
1600/1680 - 1701/1680 = 1600 - 1701/1680 = -101/1680
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: