Subtract 1/81 from 20/8
1st number: 2 4/8, 2nd number: 1/81
20/8 - 1/81 is 403/162.
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,
20/8 = 20 × 81/8 × 81 = 1620/648 - Likewise, for the 2nd fraction, since 81 × 8 = 648,
1/81 = 1 × 8/81 × 8 = 8/648 - Subtract the two like fractions:
1620/648 - 8/648 = 1620 - 8/648 = 1612/648 - After reducing the fraction, the answer is 403/162
- In mixed form: 279/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/8-1/81 20/8-2/81 20/16-1/81 60/8-1/81 20/8-3/81 20/24-1/81 20/8-5/81 20/40-1/81 20/8-7/81 20/56-1/81