Subtract 21/63 from 9/10
9/10 - 21/63 is 17/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 63 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 10 × 63 = 630,
9/10 = 9 × 63/10 × 63 = 567/630 - Likewise, for the 2nd fraction, since 63 × 10 = 630,
21/63 = 21 × 10/63 × 10 = 210/630 - Subtract the two like fractions:
567/630 - 210/630 = 567 - 210/630 = 357/630 - After reducing the fraction, the answer is 17/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/10-21/63 9/10-42/63 9/20-21/63 27/10-21/63 9/30-21/63 45/10-21/63 9/50-21/63 63/10-21/63 9/70-21/63