Subtract 12/9 from 8/42
1st number: 8/42, 2nd number: 1 3/9
8/42 - 12/9 is -8/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 9 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 42 × 3 = 126,
8/42 = 8 × 3/42 × 3 = 24/126 - Likewise, for the 2nd fraction, since 9 × 14 = 126,
12/9 = 12 × 14/9 × 14 = 168/126 - Subtract the two like fractions:
24/126 - 168/126 = 24 - 168/126 = -144/126 - After reducing the fraction, the answer is -8/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/42-12/9 8/42-24/9 8/84-12/9 8/42-12/18 24/42-12/9 8/42-36/9 8/42-12/27 40/42-12/9 8/42-60/9 8/42-12/45 56/42-12/9 8/42-84/9 8/42-12/63