Subtract 1/42 from 18/8
1st number: 2 2/8, 2nd number: 1/42
18/8 - 1/42 is 187/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 42 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
18/8 = 18 × 21/8 × 21 = 378/168 - Likewise, for the 2nd fraction, since 42 × 4 = 168,
1/42 = 1 × 4/42 × 4 = 4/168 - Subtract the two like fractions:
378/168 - 4/168 = 378 - 4/168 = 374/168 - After reducing the fraction, the answer is 187/84
- In mixed form: 219/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/8-1/42 18/8-2/42 18/16-1/42 18/8-1/84 54/8-1/42 18/8-3/42 18/24-1/42 90/8-1/42 18/8-5/42 18/40-1/42 18/8-7/42 18/56-1/42