Subtract 8/5 from 21/12
1st number: 1 9/12, 2nd number: 1 3/5
21/12 - 8/5 is 3/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 5 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 12 × 5 = 60,
21/12 = 21 × 5/12 × 5 = 105/60 - Likewise, for the 2nd fraction, since 5 × 12 = 60,
8/5 = 8 × 12/5 × 12 = 96/60 - Subtract the two like fractions:
105/60 - 96/60 = 105 - 96/60 = 9/60 - After reducing the fraction, the answer is 3/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12-8/5 21/12-16/5 21/24-8/5 21/12-8/10 63/12-8/5 21/12-24/5 21/36-8/5 21/12-8/15 21/12-40/5 21/60-8/5 21/12-8/25 21/12-56/5 21/84-8/5 21/12-8/35