Subtract 9/80 from 20/84
20/84 - 9/80 is 211/1680.
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,
20/84 = 20 × 20/84 × 20 = 400/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
9/80 = 9 × 21/80 × 21 = 189/1680 - Subtract the two like fractions:
400/1680 - 189/1680 = 400 - 189/1680 = 211/1680
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/84-9/80 20/84-18/80 60/84-9/80 20/84-27/80 20/84-45/80 20/84-63/80