Answers

Add 2/21 and 27/80

2/21 + 27/80 is 727/1680.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 80 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 21 × 80 = 1680,
   2/21 = 2 × 80/21 × 80 = 160/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   27/80 = 27 × 21/80 × 21 = 567/1680
4. Add the two like fractions:
   160/1680 + 567/1680 = 160 + 567/1680 = 727/1680
5. So, 2/21 + 27/80 = 727/1680

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