Answers

Add 20/81 and 9/60

20/81 + 9/60 is 643/1620.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 60 is 1620
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1620
2. For the 1st fraction, since 81 × 20 = 1620,
   20/81 = 20 × 20/81 × 20 = 400/1620
3. Likewise, for the 2nd fraction, since 60 × 27 = 1620,
   9/60 = 9 × 27/60 × 27 = 243/1620
4. Add the two like fractions:
   400/1620 + 243/1620 = 400 + 243/1620 = 643/1620
5. So, 20/81 + 9/60 = 643/1620

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