Subtract 1/90 from 2/80
2/80 - 1/90 is 1/72.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 90 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
2/80 = 2 × 9/80 × 9 = 18/720 - Likewise, for the 2nd fraction, since 90 × 8 = 720,
1/90 = 1 × 8/90 × 8 = 8/720 - Subtract the two like fractions:
18/720 - 8/720 = 18 - 8/720 = 10/720 - After reducing the fraction, the answer is 1/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/80-1/90 2/80-2/90 6/80-1/90 2/80-3/90 10/80-1/90 2/80-5/90 14/80-1/90 2/80-7/90