Subtract 30/9 from 21/63
1st number: 21/63, 2nd number: 3 3/9
21/63 - 30/9 is -3/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 63 × 1 = 63,
21/63 = 21 × 1/63 × 1 = 21/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
30/9 = 30 × 7/9 × 7 = 210/63 - Subtract the two like fractions:
21/63 - 210/63 = 21 - 210/63 = -189/63 - After reducing the fraction, the answer is -3/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/63-30/9 21/63-60/9 21/63-30/18 21/63-90/9 21/63-30/27 21/63-30/45 21/63-30/63