Subtract 12/80 from 20/90
20/90 - 12/80 is 13/180.
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,
20/90 = 20 × 8/90 × 8 = 160/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
12/80 = 12 × 9/80 × 9 = 108/720 - Subtract the two like fractions:
160/720 - 108/720 = 160 - 108/720 = 52/720 - After reducing the fraction, the answer is 13/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/90-12/80 20/90-24/80 60/90-12/80 20/90-36/80 20/90-60/80 20/90-84/80