Subtract 30/18 from 6/42
1st number: 6/42, 2nd number: 1 12/18
6/42 - 30/18 is -32/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 42 × 3 = 126,
6/42 = 6 × 3/42 × 3 = 18/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
30/18 = 30 × 7/18 × 7 = 210/126 - Subtract the two like fractions:
18/126 - 210/126 = 18 - 210/126 = -192/126 - After reducing the fraction, the answer is -32/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/42-30/18 6/42-60/18 6/84-30/18 6/42-30/36 18/42-30/18 6/42-90/18 6/42-30/54 30/42-30/18 6/42-30/90