Subtract 20/90 from 12/9
1st number: 1 3/9, 2nd number: 20/90
12/9 - 20/90 is 10/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 9 × 10 = 90,
12/9 = 12 × 10/9 × 10 = 120/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
20/90 = 20 × 1/90 × 1 = 20/90 - Subtract the two like fractions:
120/90 - 20/90 = 120 - 20/90 = 100/90 - After reducing the fraction, the answer is 10/9
- In mixed form: 11/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/9-20/90 12/9-40/90 12/18-20/90 36/9-20/90 12/9-60/90 12/27-20/90 60/9-20/90 12/45-20/90 84/9-20/90 12/63-20/90