Subtract 18/30 from 15/63
15/63 - 18/30 is -38/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 30 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 63 × 10 = 630,
15/63 = 15 × 10/63 × 10 = 150/630 - Likewise, for the 2nd fraction, since 30 × 21 = 630,
18/30 = 18 × 21/30 × 21 = 378/630 - Subtract the two like fractions:
150/630 - 378/630 = 150 - 378/630 = -228/630 - After reducing the fraction, the answer is -38/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/63-18/30 15/63-36/30 15/63-18/60 45/63-18/30 15/63-54/30 15/63-18/90 75/63-18/30 15/63-90/30