Answers

Add 15/84 and 18/80

15/84 + 18/80 is 113/280.

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,
   15/84 = 15 × 20/84 × 20 = 300/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   18/80 = 18 × 21/80 × 21 = 378/1680
4. Add the two like fractions:
   300/1680 + 378/1680 = 300 + 378/1680 = 678/1680
5. 678/1680 simplified gives 113/280
6. So, 15/84 + 18/80 = 113/280

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