Subtract 42/63 from 18/48
18/48 - 42/63 is -7/24.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 48 and 63 is 1008
Next, find the equivalent fraction of both fractional numbers with denominator 1008 - For the 1st fraction, since 48 × 21 = 1008,
18/48 = 18 × 21/48 × 21 = 378/1008 - Likewise, for the 2nd fraction, since 63 × 16 = 1008,
42/63 = 42 × 16/63 × 16 = 672/1008 - Subtract the two like fractions:
378/1008 - 672/1008 = 378 - 672/1008 = -294/1008 - After reducing the fraction, the answer is -7/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/48-42/63 18/48-84/63 18/96-42/63 54/48-42/63 90/48-42/63