Subtract 21/63 from 6/30
6/30 - 21/63 is -2/15.
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,
6/30 = 6 × 21/30 × 21 = 126/630 - Likewise, for the 2nd fraction, since 63 × 10 = 630,
21/63 = 21 × 10/63 × 10 = 210/630 - Subtract the two like fractions:
126/630 - 210/630 = 126 - 210/630 = -84/630 - After reducing the fraction, the answer is -2/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/30-21/63 6/30-42/63 6/60-21/63 18/30-21/63 6/90-21/63 42/30-21/63