Subtract 8/63 from 21/30
21/30 - 8/63 is 361/630.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 63 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 30 × 21 = 630,
21/30 = 21 × 21/30 × 21 = 441/630 - Likewise, for the 2nd fraction, since 63 × 10 = 630,
8/63 = 8 × 10/63 × 10 = 80/630 - Subtract the two like fractions:
441/630 - 80/630 = 441 - 80/630 = 361/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30-8/63 21/30-16/63 21/60-8/63 63/30-8/63 21/30-24/63 21/90-8/63 21/30-40/63 21/30-56/63