Subtract 1/63 from 21/30
21/30 - 1/63 is 431/630.
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,
1/63 = 1 × 10/63 × 10 = 10/630 - Subtract the two like fractions:
441/630 - 10/630 = 441 - 10/630 = 431/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30-1/63 21/30-2/63 21/60-1/63 63/30-1/63 21/30-3/63 21/90-1/63 21/30-5/63 21/30-7/63