Subtract 9/12 from 25/42
25/42 - 9/12 is -13/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 42 × 2 = 84,
25/42 = 25 × 2/42 × 2 = 50/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
9/12 = 9 × 7/12 × 7 = 63/84 - Subtract the two like fractions:
50/84 - 63/84 = 50 - 63/84 = -13/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/42-9/12 25/42-18/12 25/84-9/12 25/42-9/24 75/42-9/12 25/42-27/12 25/42-9/36 25/42-45/12 25/42-9/60 25/42-63/12 25/42-9/84