Answers

Add 18/81 and 84/20

1^st number: 18/81, 2^nd number: 4 4/20

18/81 + 84/20 is 199/45.

Steps for adding fractions

1. 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
2. For the 1st fraction, since 81 × 20 = 1620,
   18/81 = 18 × 20/81 × 20 = 360/1620
3. Likewise, for the 2nd fraction, since 20 × 81 = 1620,
   84/20 = 84 × 81/20 × 81 = 6804/1620
4. Add the two like fractions:
   360/1620 + 6804/1620 = 360 + 6804/1620 = 7164/1620
5. 7164/1620 simplified gives 199/45
6. So, 18/81 + 84/20 = 199/45
   In mixed form: 419/45

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