Subtract 27/7 from 18/28
1st number: 18/28, 2nd number: 3 6/7
18/28 - 27/7 is -45/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 7 is 28
Next, find the equivalent fraction of both fractional numbers with denominator 28 - For the 1st fraction, since 28 × 1 = 28,
18/28 = 18 × 1/28 × 1 = 18/28 - Likewise, for the 2nd fraction, since 7 × 4 = 28,
27/7 = 27 × 4/7 × 4 = 108/28 - Subtract the two like fractions:
18/28 - 108/28 = 18 - 108/28 = -90/28 - After reducing the fraction, the answer is -45/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/28-27/7 18/28-54/7 18/56-27/7 18/28-27/14 54/28-27/7 18/28-81/7 18/84-27/7 18/28-27/21 90/28-27/7 18/28-27/35 18/28-27/49