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