Add 42/20 and 9/81
1st number: 2 2/20, 2nd number: 9/81
42/20 + 9/81 is 199/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 81 is 1620
Next, find the equivalent fraction of both fractional numbers with denominator 1620 - For the 1st fraction, since 20 × 81 = 1620,
42/20 = 42 × 81/20 × 81 = 3402/1620 - Likewise, for the 2nd fraction, since 81 × 20 = 1620,
9/81 = 9 × 20/81 × 20 = 180/1620 - Add the two like fractions:
3402/1620 + 180/1620 = 3402 + 180/1620 = 3582/1620 - 3582/1620 simplified gives 199/90
- So, 42/20 + 9/81 = 199/90
In mixed form: 219/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/20+9/81 42/20+18/81 42/40+9/81 42/20+27/81 42/60+9/81 42/20+45/81 42/20+63/81