Subtract 30/21 from 15/6
1st number: 2 3/6, 2nd number: 1 9/21
15/6 - 30/21 is 15/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 6 × 7 = 42,
15/6 = 15 × 7/6 × 7 = 105/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
30/21 = 30 × 2/21 × 2 = 60/42 - Subtract the two like fractions:
105/42 - 60/42 = 105 - 60/42 = 45/42 - After reducing the fraction, the answer is 15/14
- In mixed form: 11/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/6-30/21 15/6-60/21 15/12-30/21 15/6-30/42 45/6-30/21 15/6-90/21 15/18-30/21 15/6-30/63 75/6-30/21 15/30-30/21 15/42-30/21