Subtract 20/63 from 15/84
15/84 - 20/63 is -5/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 63 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 84 × 3 = 252,
15/84 = 15 × 3/84 × 3 = 45/252 - Likewise, for the 2nd fraction, since 63 × 4 = 252,
20/63 = 20 × 4/63 × 4 = 80/252 - Subtract the two like fractions:
45/252 - 80/252 = 45 - 80/252 = -35/252 - After reducing the fraction, the answer is -5/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/84-20/63 15/84-40/63 45/84-20/63 15/84-60/63 75/84-20/63