Subtract 42/12 from 30/84
1st number: 30/84, 2nd number: 3 6/12
30/84 - 42/12 is -22/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
30/84 = 30 × 1/84 × 1 = 30/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
42/12 = 42 × 7/12 × 7 = 294/84 - Subtract the two like fractions:
30/84 - 294/84 = 30 - 294/84 = -264/84 - After reducing the fraction, the answer is -22/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/84-42/12 30/84-84/12 30/84-42/24 90/84-42/12 30/84-42/36 30/84-42/60 30/84-42/84