Add 20/81 and 42/20
1st number: 20/81, 2nd number: 2 2/20
20/81 + 42/20 is 1901/810.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 20 is 1620
Next, find the equivalent fraction of both fractional numbers with denominator 1620 - For the 1st fraction, since 81 × 20 = 1620,
20/81 = 20 × 20/81 × 20 = 400/1620 - Likewise, for the 2nd fraction, since 20 × 81 = 1620,
42/20 = 42 × 81/20 × 81 = 3402/1620 - Add the two like fractions:
400/1620 + 3402/1620 = 400 + 3402/1620 = 3802/1620 - 3802/1620 simplified gives 1901/810
- So, 20/81 + 42/20 = 1901/810
In mixed form: 2281/810
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/81+42/20 20/81+84/20 20/81+42/40 60/81+42/20 20/81+42/60