Answers

Add 1/84 and 60/80

1/84 + 60/80 is 16/21.

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,
   1/84 = 1 × 20/84 × 20 = 20/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   60/80 = 60 × 21/80 × 21 = 1260/1680
4. Add the two like fractions:
   20/1680 + 1260/1680 = 20 + 1260/1680 = 1280/1680
5. 1280/1680 simplified gives 16/21
6. So, 1/84 + 60/80 = 16/21

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