Subtract 18/7 from 18/12
1st number: 1 6/12, 2nd number: 2 4/7
18/12 - 18/7 is -15/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 7 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 7 × 12 = 84,
18/7 = 18 × 12/7 × 12 = 216/84 - Subtract the two like fractions:
126/84 - 216/84 = 126 - 216/84 = -90/84 - After reducing the fraction, the answer is -15/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/12-18/7 18/12-36/7 18/24-18/7 18/12-18/14 54/12-18/7 18/12-54/7 18/36-18/7 18/12-18/21 90/12-18/7 18/12-90/7 18/60-18/7 18/12-18/35 18/84-18/7 18/12-18/49