Subtract 9/80 from 1/21
1/21 - 9/80 is -109/1680.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 21 × 80 = 1680,
1/21 = 1 × 80/21 × 80 = 80/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
9/80 = 9 × 21/80 × 21 = 189/1680 - Subtract the two like fractions:
80/1680 - 189/1680 = 80 - 189/1680 = -109/1680
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21-9/80 1/21-18/80 1/42-9/80 3/21-9/80 1/21-27/80 1/63-9/80 5/21-9/80 1/21-45/80 7/21-9/80 1/21-63/80