Subtract 21/20 from 45/2
1st number: 22 1/2, 2nd number: 1 1/20
45/2 - 21/20 is 429/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 20 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 2 × 10 = 20,
45/2 = 45 × 10/2 × 10 = 450/20 - Likewise, for the 2nd fraction, since 20 × 1 = 20,
21/20 = 21 × 1/20 × 1 = 21/20 - Subtract the two like fractions:
450/20 - 21/20 = 450 - 21/20 = 429/20 - In mixed form: 219/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/2-21/20 45/2-42/20 45/4-21/20 45/2-21/40 45/2-63/20 45/6-21/20 45/2-21/60 45/10-21/20 45/14-21/20