Subtract 42/84 from 3/63
3/63 - 42/84 is -19/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 84 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 63 × 4 = 252,
3/63 = 3 × 4/63 × 4 = 12/252 - Likewise, for the 2nd fraction, since 84 × 3 = 252,
42/84 = 42 × 3/84 × 3 = 126/252 - Subtract the two like fractions:
12/252 - 126/252 = 12 - 126/252 = -114/252 - After reducing the fraction, the answer is -19/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/63-42/84 9/63-42/84 15/63-42/84 21/63-42/84