Subtract 30/18 from 10/42
1st number: 10/42, 2nd number: 1 12/18
10/42 - 30/18 is -10/7.
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,
10/42 = 10 × 3/42 × 3 = 30/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
30/18 = 30 × 7/18 × 7 = 210/126 - Subtract the two like fractions:
30/126 - 210/126 = 30 - 210/126 = -180/126 - After reducing the fraction, the answer is -10/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/42-30/18 10/42-60/18 10/84-30/18 10/42-30/36 30/42-30/18 10/42-90/18 10/42-30/54 50/42-30/18 10/42-30/90 70/42-30/18