Subtract 12/9 from 80/90
1st number: 80/90, 2nd number: 1 3/9
80/90 - 12/9 is -4/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 9 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 90 × 1 = 90,
80/90 = 80 × 1/90 × 1 = 80/90 - Likewise, for the 2nd fraction, since 9 × 10 = 90,
12/9 = 12 × 10/9 × 10 = 120/90 - Subtract the two like fractions:
80/90 - 120/90 = 80 - 120/90 = -40/90 - After reducing the fraction, the answer is -4/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/90-24/9 80/90-12/18 80/90-36/9 80/90-12/27 80/90-60/9 80/90-12/45 80/90-84/9 80/90-12/63