Subtract 12/20 from 21/5
1st number: 4 1/5, 2nd number: 12/20
21/5 - 12/20 is 18/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 20 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 5 × 4 = 20,
21/5 = 21 × 4/5 × 4 = 84/20 - Likewise, for the 2nd fraction, since 20 × 1 = 20,
12/20 = 12 × 1/20 × 1 = 12/20 - Subtract the two like fractions:
84/20 - 12/20 = 84 - 12/20 = 72/20 - After reducing the fraction, the answer is 18/5
- In mixed form: 33/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/5-12/20 21/5-24/20 21/10-12/20 21/5-12/40 63/5-12/20 21/5-36/20 21/15-12/20 21/5-12/60 21/5-60/20 21/25-12/20 21/5-84/20 21/35-12/20