Answers

Add 6/84 and 21/80

6/84 + 21/80 is 187/560.

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,
   6/84 = 6 × 20/84 × 20 = 120/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   21/80 = 21 × 21/80 × 21 = 441/1680
4. Add the two like fractions:
   120/1680 + 441/1680 = 120 + 441/1680 = 561/1680
5. 561/1680 simplified gives 187/560
6. So, 6/84 + 21/80 = 187/560

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