Subtract 30/12 from 21/6
1st number: 3 3/6, 2nd number: 2 6/12
21/6 - 30/12 is 1/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 12 is 12
Next, find the equivalent fraction of both fractional numbers with denominator 12 - For the 1st fraction, since 6 × 2 = 12,
21/6 = 21 × 2/6 × 2 = 42/12 - Likewise, for the 2nd fraction, since 12 × 1 = 12,
30/12 = 30 × 1/12 × 1 = 30/12 - Subtract the two like fractions:
42/12 - 30/12 = 42 - 30/12 = 12/12 - After reducing the fraction, the answer is 1/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/6-30/12 21/6-60/12 21/12-30/12 21/6-30/24 63/6-30/12 21/6-90/12 21/18-30/12 21/6-30/36 21/30-30/12 21/6-30/60 21/42-30/12 21/6-30/84