Subtract 12/20 from 21/63
21/63 - 12/20 is -4/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 20 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 63 × 20 = 1260,
21/63 = 21 × 20/63 × 20 = 420/1260 - Likewise, for the 2nd fraction, since 20 × 63 = 1260,
12/20 = 12 × 63/20 × 63 = 756/1260 - Subtract the two like fractions:
420/1260 - 756/1260 = 420 - 756/1260 = -336/1260 - After reducing the fraction, the answer is -4/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/63-12/20 21/63-24/20 21/63-12/40 21/63-36/20 21/63-12/60 21/63-60/20 21/63-84/20