Answers

Add 10/84 and 9/80

10/84 + 9/80 is 389/1680.

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,
   10/84 = 10 × 20/84 × 20 = 200/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   9/80 = 9 × 21/80 × 21 = 189/1680
4. Add the two like fractions:
   200/1680 + 189/1680 = 200 + 189/1680 = 389/1680
5. So, 10/84 + 9/80 = 389/1680

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