Answers

Add 36/84 and 21/80

36/84 + 21/80 is 387/560.

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,
   36/84 = 36 × 20/84 × 20 = 720/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   21/80 = 21 × 21/80 × 21 = 441/1680
4. Add the two like fractions:
   720/1680 + 441/1680 = 720 + 441/1680 = 1161/1680
5. 1161/1680 simplified gives 387/560
6. So, 36/84 + 21/80 = 387/560

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