Subtract 9/80 from 2/90
2/90 - 9/80 is -13/144.
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,
2/90 = 2 × 8/90 × 8 = 16/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
9/80 = 9 × 9/80 × 9 = 81/720 - Subtract the two like fractions:
16/720 - 81/720 = 16 - 81/720 = -65/720 - After reducing the fraction, the answer is -13/144
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/90-9/80 2/90-18/80 6/90-9/80 2/90-27/80 10/90-9/80 2/90-45/80 14/90-9/80 2/90-63/80