Subtract 21/35 from 12/9
1st number: 1 3/9, 2nd number: 21/35
12/9 - 21/35 is 11/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 35 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 9 × 35 = 315,
12/9 = 12 × 35/9 × 35 = 420/315 - Likewise, for the 2nd fraction, since 35 × 9 = 315,
21/35 = 21 × 9/35 × 9 = 189/315 - Subtract the two like fractions:
420/315 - 189/315 = 420 - 189/315 = 231/315 - After reducing the fraction, the answer is 11/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/9-21/35 12/9-42/35 12/18-21/35 12/9-21/70 36/9-21/35 12/9-63/35 12/27-21/35 60/9-21/35 12/45-21/35 84/9-21/35 12/63-21/35