Subtract 7/81 from 42/8
1st number: 5 2/8, 2nd number: 7/81
42/8 - 7/81 is 1673/324.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 81 is 648
Next, find the equivalent fraction of both fractional numbers with denominator 648 - For the 1st fraction, since 8 × 81 = 648,
42/8 = 42 × 81/8 × 81 = 3402/648 - Likewise, for the 2nd fraction, since 81 × 8 = 648,
7/81 = 7 × 8/81 × 8 = 56/648 - Subtract the two like fractions:
3402/648 - 56/648 = 3402 - 56/648 = 3346/648 - After reducing the fraction, the answer is 1673/324
- In mixed form: 553/324
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/8-7/81 42/8-14/81 42/16-7/81 42/8-21/81 42/24-7/81 42/8-35/81 42/40-7/81 42/8-49/81 42/56-7/81