Subtract 3/45 from 21/15
1st number: 1 6/15, 2nd number: 3/45
21/15 - 3/45 is 4/3.
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,
3/45 = 3 × 1/45 × 1 = 3/45 - Subtract the two like fractions:
63/45 - 3/45 = 63 - 3/45 = 60/45 - After reducing the fraction, the answer is 4/3
- In mixed form: 11/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15-3/45 21/15-6/45 21/30-3/45 21/15-3/90 63/15-3/45 21/15-9/45 21/45-3/45 21/15-15/45 21/75-3/45 21/15-21/45