Answers

Add 27/84 and 9/80

27/84 + 9/80 is 243/560.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 80 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 84 × 20 = 1680,
   27/84 = 27 × 20/84 × 20 = 540/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   9/80 = 9 × 21/80 × 21 = 189/1680
4. Add the two like fractions:
   540/1680 + 189/1680 = 540 + 189/1680 = 729/1680
5. 729/1680 simplified gives 243/560
6. So, 27/84 + 9/80 = 243/560

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