Subtract 9/6 from 30/21
1st number: 1 9/21, 2nd number: 1 3/6
30/21 - 9/6 is -1/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 6 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
30/21 = 30 × 2/21 × 2 = 60/42 - Likewise, for the 2nd fraction, since 6 × 7 = 42,
9/6 = 9 × 7/6 × 7 = 63/42 - Subtract the two like fractions:
60/42 - 63/42 = 60 - 63/42 = -3/42 - After reducing the fraction, the answer is -1/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/21-9/6 30/21-18/6 30/42-9/6 30/21-9/12 90/21-9/6 30/21-27/6 30/63-9/6 30/21-9/18 30/21-45/6 30/21-9/30 30/21-63/6 30/21-9/42