Subtract 8/21 from 30/63
30/63 - 8/21 is 2/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 21 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 63 × 1 = 63,
30/63 = 30 × 1/63 × 1 = 30/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
8/21 = 8 × 3/21 × 3 = 24/63 - Subtract the two like fractions:
30/63 - 24/63 = 30 - 24/63 = 6/63 - After reducing the fraction, the answer is 2/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/63-8/21 30/63-16/21 30/63-8/42 90/63-8/21 30/63-24/21 30/63-8/63 30/63-40/21 30/63-56/21