Subtract 21/18 from 45/5
1st number: 9 0/5, 2nd number: 1 3/18
45/5 - 21/18 is 47/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 5 × 18 = 90,
45/5 = 45 × 18/5 × 18 = 810/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
21/18 = 21 × 5/18 × 5 = 105/90 - Subtract the two like fractions:
810/90 - 105/90 = 810 - 105/90 = 705/90 - After reducing the fraction, the answer is 47/6
- In mixed form: 75/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/5-21/18 45/5-42/18 45/10-21/18 45/5-21/36 45/5-63/18 45/15-21/18 45/5-21/54 45/25-21/18 45/5-21/90 45/35-21/18