Subtract 18/16 from 28/42
1st number: 28/42, 2nd number: 1 2/16
28/42 - 18/16 is -11/24.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 16 is 336
Next, find the equivalent fraction of both fractional numbers with denominator 336 - For the 1st fraction, since 42 × 8 = 336,
28/42 = 28 × 8/42 × 8 = 224/336 - Likewise, for the 2nd fraction, since 16 × 21 = 336,
18/16 = 18 × 21/16 × 21 = 378/336 - Subtract the two like fractions:
224/336 - 378/336 = 224 - 378/336 = -154/336 - After reducing the fraction, the answer is -11/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/42-18/16 28/42-36/16 28/84-18/16 28/42-18/32 84/42-18/16 28/42-54/16 28/42-18/48 28/42-90/16 28/42-18/80