Subtract 9/20 from 45/21
1st number: 2 3/21, 2nd number: 9/20
45/21 - 9/20 is 237/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
45/21 = 45 × 20/21 × 20 = 900/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
9/20 = 9 × 21/20 × 21 = 189/420 - Subtract the two like fractions:
900/420 - 189/420 = 900 - 189/420 = 711/420 - After reducing the fraction, the answer is 237/140
- In mixed form: 197/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21-9/20 45/21-18/20 45/42-9/20 45/21-9/40 45/21-27/20 45/63-9/20 45/21-9/60 45/21-45/20 45/21-63/20