Subtract 1/3 from 18/42
18/42 - 1/3 is 2/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 3 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
18/42 = 18 × 1/42 × 1 = 18/42 - Likewise, for the 2nd fraction, since 3 × 14 = 42,
1/3 = 1 × 14/3 × 14 = 14/42 - Subtract the two like fractions:
18/42 - 14/42 = 18 - 14/42 = 4/42 - After reducing the fraction, the answer is 2/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/42-1/3 18/42-2/3 18/84-1/3 18/42-1/6 54/42-1/3 18/42-1/9 90/42-1/3 18/42-5/3 18/42-1/15 18/42-7/3 18/42-1/21