Subtract 45/5 from 21/2
1st number: 10 1/2, 2nd number: 9 0/5
21/2 - 45/5 is 3/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 5 is 10
Next, find the equivalent fraction of both fractional numbers with denominator 10 - For the 1st fraction, since 2 × 5 = 10,
21/2 = 21 × 5/2 × 5 = 105/10 - Likewise, for the 2nd fraction, since 5 × 2 = 10,
45/5 = 45 × 2/5 × 2 = 90/10 - Subtract the two like fractions:
105/10 - 90/10 = 105 - 90/10 = 15/10 - After reducing the fraction, the answer is 3/2
- In mixed form: 11/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/2-45/5 21/2-90/5 21/4-45/5 21/2-45/10 63/2-45/5 21/6-45/5 21/2-45/15 21/10-45/5 21/2-45/25 21/14-45/5 21/2-45/35