Subtract 3/4 from 21/63
21/63 - 3/4 is -5/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 4 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 63 × 4 = 252,
21/63 = 21 × 4/63 × 4 = 84/252 - Likewise, for the 2nd fraction, since 4 × 63 = 252,
3/4 = 3 × 63/4 × 63 = 189/252 - Subtract the two like fractions:
84/252 - 189/252 = 84 - 189/252 = -105/252 - After reducing the fraction, the answer is -5/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/63-3/4 21/63-6/4 21/63-3/8 21/63-9/4 21/63-3/12 21/63-15/4 21/63-3/20 21/63-21/4 21/63-3/28