Subtract 42/81 from 28/16
1st number: 1 12/16, 2nd number: 42/81
28/16 - 42/81 is 133/108.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 81 is 1296
Next, find the equivalent fraction of both fractional numbers with denominator 1296 - For the 1st fraction, since 16 × 81 = 1296,
28/16 = 28 × 81/16 × 81 = 2268/1296 - Likewise, for the 2nd fraction, since 81 × 16 = 1296,
42/81 = 42 × 16/81 × 16 = 672/1296 - Subtract the two like fractions:
2268/1296 - 672/1296 = 2268 - 672/1296 = 1596/1296 - After reducing the fraction, the answer is 133/108
- In mixed form: 125/108
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/16-42/81 28/16-84/81 28/32-42/81 84/16-42/81 28/48-42/81 28/80-42/81