Subtract 9/84 from 12/42
12/42 - 9/84 is 5/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 42 × 2 = 84,
12/42 = 12 × 2/42 × 2 = 24/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
9/84 = 9 × 1/84 × 1 = 9/84 - Subtract the two like fractions:
24/84 - 9/84 = 24 - 9/84 = 15/84 - After reducing the fraction, the answer is 5/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/42-9/84 12/42-18/84 12/84-9/84 36/42-9/84 12/42-27/84 60/42-9/84 12/42-45/84 84/42-9/84 12/42-63/84