Answers

Add 9/84 and 6/80

9/84 + 6/80 is 51/280.

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,
   9/84 = 9 × 20/84 × 20 = 180/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   6/80 = 6 × 21/80 × 21 = 126/1680
4. Add the two like fractions:
   180/1680 + 126/1680 = 180 + 126/1680 = 306/1680
5. 306/1680 simplified gives 51/280
6. So, 9/84 + 6/80 = 51/280

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