Subtract 7/81 from 42/5
1st number: 8 2/5, 2nd number: 7/81
42/5 - 7/81 is 3367/405.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 81 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 5 × 81 = 405,
42/5 = 42 × 81/5 × 81 = 3402/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
7/81 = 7 × 5/81 × 5 = 35/405 - Subtract the two like fractions:
3402/405 - 35/405 = 3402 - 35/405 = 3367/405 - In mixed form: 8127/405
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/5-7/81 42/5-14/81 42/10-7/81 42/5-21/81 42/15-7/81 42/5-35/81 42/25-7/81 42/5-49/81 42/35-7/81