Subtract 28/7 from 18/12
1st number: 1 6/12, 2nd number: 4 0/7
18/12 - 28/7 is -5/2.
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,
28/7 = 28 × 12/7 × 12 = 336/84 - Subtract the two like fractions:
126/84 - 336/84 = 126 - 336/84 = -210/84 - After reducing the fraction, the answer is -5/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/12-28/7 18/12-56/7 18/24-28/7 18/12-28/14 54/12-28/7 18/12-84/7 18/36-28/7 18/12-28/21 90/12-28/7 18/60-28/7 18/12-28/35 18/84-28/7 18/12-28/49