Subtract 21/30 from 12/63
12/63 - 21/30 is -107/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 30 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 63 × 10 = 630,
12/63 = 12 × 10/63 × 10 = 120/630 - Likewise, for the 2nd fraction, since 30 × 21 = 630,
21/30 = 21 × 21/30 × 21 = 441/630 - Subtract the two like fractions:
120/630 - 441/630 = 120 - 441/630 = -321/630 - After reducing the fraction, the answer is -107/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/63-21/30 12/63-42/30 12/63-21/60 36/63-21/30 12/63-63/30 12/63-21/90 60/63-21/30 84/63-21/30