Subtract 18/4 from 9/42
1st number: 9/42, 2nd number: 4 2/4
9/42 - 18/4 is -30/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 42 × 2 = 84,
9/42 = 9 × 2/42 × 2 = 18/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
18/4 = 18 × 21/4 × 21 = 378/84 - Subtract the two like fractions:
18/84 - 378/84 = 18 - 378/84 = -360/84 - After reducing the fraction, the answer is -30/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/42-18/4 9/42-36/4 9/84-18/4 9/42-18/8 27/42-18/4 9/42-54/4 9/42-18/12 45/42-18/4 9/42-90/4 9/42-18/20 63/42-18/4 9/42-18/28