Subtract 30/84 from 18/12
1st number: 1 6/12, 2nd number: 30/84
18/12 - 30/84 is 8/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
18/12 = 18 × 7/12 × 7 = 126/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
30/84 = 30 × 1/84 × 1 = 30/84 - Subtract the two like fractions:
126/84 - 30/84 = 126 - 30/84 = 96/84 - After reducing the fraction, the answer is 8/7
- In mixed form: 11/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/12-30/84 18/12-60/84 18/24-30/84 54/12-30/84 18/12-90/84 18/36-30/84 90/12-30/84 18/60-30/84 18/84-30/84