Subtract 21/45 from 9/12
9/12 - 21/45 is 17/60.
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,
21/45 = 21 × 4/45 × 4 = 84/180 - Subtract the two like fractions:
135/180 - 84/180 = 135 - 84/180 = 51/180 - After reducing the fraction, the answer is 17/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/12-21/45 9/12-42/45 9/24-21/45 9/12-21/90 27/12-21/45 9/12-63/45 9/36-21/45 45/12-21/45 9/60-21/45 63/12-21/45 9/84-21/45