Subtract 9/20 from 9/80
9/80 - 9/20 is -27/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 20 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 80 × 1 = 80,
9/80 = 9 × 1/80 × 1 = 9/80 - Likewise, for the 2nd fraction, since 20 × 4 = 80,
9/20 = 9 × 4/20 × 4 = 36/80 - Subtract the two like fractions:
9/80 - 36/80 = 9 - 36/80 = -27/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/80-9/20 9/80-18/20 9/80-9/40 27/80-9/20 9/80-27/20 9/80-9/60 45/80-9/20 9/80-45/20 63/80-9/20 9/80-63/20