Subtract 9/45 from 21/15
1st number: 1 6/15, 2nd number: 9/45
21/15 - 9/45 is 6/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 45 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 15 × 3 = 45,
21/15 = 21 × 3/15 × 3 = 63/45 - Likewise, for the 2nd fraction, since 45 × 1 = 45,
9/45 = 9 × 1/45 × 1 = 9/45 - Subtract the two like fractions:
63/45 - 9/45 = 63 - 9/45 = 54/45 - After reducing the fraction, the answer is 6/5
- In mixed form: 11/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15-9/45 21/15-18/45 21/30-9/45 21/15-9/90 63/15-9/45 21/15-27/45 21/45-9/45 21/75-9/45 21/15-63/45