Subtract 42/81 from 28/48
28/48 - 42/81 is 7/108.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 48 and 81 is 1296
Next, find the equivalent fraction of both fractional numbers with denominator 1296 - For the 1st fraction, since 48 × 27 = 1296,
28/48 = 28 × 27/48 × 27 = 756/1296 - Likewise, for the 2nd fraction, since 81 × 16 = 1296,
42/81 = 42 × 16/81 × 16 = 672/1296 - Subtract the two like fractions:
756/1296 - 672/1296 = 756 - 672/1296 = 84/1296 - After reducing the fraction, the answer is 7/108
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/48-42/81 28/48-84/81 28/96-42/81 84/48-42/81