Subtract 18/56 from 15/42
15/42 - 18/56 is 1/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 56 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 42 × 4 = 168,
15/42 = 15 × 4/42 × 4 = 60/168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,
18/56 = 18 × 3/56 × 3 = 54/168 - Subtract the two like fractions:
60/168 - 54/168 = 60 - 54/168 = 6/168 - After reducing the fraction, the answer is 1/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/42-18/56 15/42-36/56 15/84-18/56 45/42-18/56 15/42-54/56 75/42-18/56 15/42-90/56