Subtract 42/63 from 15/20
15/20 - 42/63 is 1/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 63 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 20 × 63 = 1260,
15/20 = 15 × 63/20 × 63 = 945/1260 - Likewise, for the 2nd fraction, since 63 × 20 = 1260,
42/63 = 42 × 20/63 × 20 = 840/1260 - Subtract the two like fractions:
945/1260 - 840/1260 = 945 - 840/1260 = 105/1260 - After reducing the fraction, the answer is 1/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/20-42/63 15/20-84/63 15/40-42/63 45/20-42/63 15/60-42/63 75/20-42/63