Answers

Add 9/80 and 10/84

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

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 84 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 80 × 21 = 1680,
   9/80 = 9 × 21/80 × 21 = 189/1680
3. Likewise, for the 2nd fraction, since 84 × 20 = 1680,
   10/84 = 10 × 20/84 × 20 = 200/1680
4. Add the two like fractions:
   189/1680 + 200/1680 = 189 + 200/1680 = 389/1680
5. So, 9/80 + 10/84 = 389/1680

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