Subtract 21/18 from 30/5
1st number: 6 0/5, 2nd number: 1 3/18
30/5 - 21/18 is 29/6.
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,
30/5 = 30 × 18/5 × 18 = 540/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
21/18 = 21 × 5/18 × 5 = 105/90 - Subtract the two like fractions:
540/90 - 105/90 = 540 - 105/90 = 435/90 - After reducing the fraction, the answer is 29/6
- In mixed form: 45/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/5-21/18 30/5-42/18 30/10-21/18 30/5-21/36 90/5-21/18 30/5-63/18 30/15-21/18 30/5-21/54 30/25-21/18 30/5-21/90 30/35-21/18