Subtract 30/9 from 42/12
1st number: 3 6/12, 2nd number: 3 3/9
42/12 - 30/9 is 1/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 9 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 12 × 3 = 36,
42/12 = 42 × 3/12 × 3 = 126/36 - Likewise, for the 2nd fraction, since 9 × 4 = 36,
30/9 = 30 × 4/9 × 4 = 120/36 - Subtract the two like fractions:
126/36 - 120/36 = 126 - 120/36 = 6/36 - After reducing the fraction, the answer is 1/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/12-30/9 42/12-60/9 42/24-30/9 42/12-30/18 42/12-90/9 42/36-30/9 42/12-30/27 42/60-30/9 42/12-30/45 42/84-30/9 42/12-30/63