Answers

Add 15/84 and 35/80

15/84 + 35/80 is 69/112.

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,
   35/80 = 35 × 21/80 × 21 = 735/1680
4. Add the two like fractions:
   300/1680 + 735/1680 = 300 + 735/1680 = 1035/1680
5. 1035/1680 simplified gives 69/112
6. So, 15/84 + 35/80 = 69/112

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