Subtract 12/16 from 28/42
28/42 - 12/16 is -1/12.
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,
12/16 = 12 × 21/16 × 21 = 252/336 - Subtract the two like fractions:
224/336 - 252/336 = 224 - 252/336 = -28/336 - After reducing the fraction, the answer is -1/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/42-12/16 28/42-24/16 28/84-12/16 28/42-12/32 84/42-12/16 28/42-36/16 28/42-12/48 28/42-60/16 28/42-12/80 28/42-84/16