Subtract 7/18 from 9/80
9/80 - 7/18 is -199/720.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 18 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
9/80 = 9 × 9/80 × 9 = 81/720 - Likewise, for the 2nd fraction, since 18 × 40 = 720,
7/18 = 7 × 40/18 × 40 = 280/720 - Subtract the two like fractions:
81/720 - 280/720 = 81 - 280/720 = -199/720
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/80-7/18 9/80-14/18 9/80-7/36 27/80-7/18 9/80-21/18 9/80-7/54 45/80-7/18 9/80-35/18 9/80-7/90 63/80-7/18 9/80-49/18