Subtract 20/84 from 12/9
1st number: 1 3/9, 2nd number: 20/84
12/9 - 20/84 is 23/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 84 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 9 × 28 = 252,
12/9 = 12 × 28/9 × 28 = 336/252 - Likewise, for the 2nd fraction, since 84 × 3 = 252,
20/84 = 20 × 3/84 × 3 = 60/252 - Subtract the two like fractions:
336/252 - 60/252 = 336 - 60/252 = 276/252 - After reducing the fraction, the answer is 23/21
- In mixed form: 12/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/9-20/84 12/9-40/84 12/18-20/84 36/9-20/84 12/9-60/84 12/27-20/84 60/9-20/84 12/45-20/84 84/9-20/84 12/63-20/84