Subtract 42/45 from 9/12
9/12 - 42/45 is -11/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 45 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 12 × 15 = 180,
9/12 = 9 × 15/12 × 15 = 135/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
42/45 = 42 × 4/45 × 4 = 168/180 - Subtract the two like fractions:
135/180 - 168/180 = 135 - 168/180 = -33/180 - After reducing the fraction, the answer is -11/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/12-42/45 9/12-84/45 9/24-42/45 9/12-42/90 27/12-42/45 9/36-42/45 45/12-42/45 9/60-42/45 63/12-42/45 9/84-42/45