Subtract 1/80 from 8/90
8/90 - 1/80 is 11/144.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 90 × 8 = 720,
8/90 = 8 × 8/90 × 8 = 64/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
1/80 = 1 × 9/80 × 9 = 9/720 - Subtract the two like fractions:
64/720 - 9/720 = 64 - 9/720 = 55/720 - After reducing the fraction, the answer is 11/144
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/90-1/80 8/90-2/80 24/90-1/80 8/90-3/80 40/90-1/80 8/90-5/80 56/90-1/80 8/90-7/80