Answers

Add 20/84 and 1/80

20/84 + 1/80 is 421/1680.

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,
   20/84 = 20 × 20/84 × 20 = 400/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   1/80 = 1 × 21/80 × 21 = 21/1680
4. Add the two like fractions:
   400/1680 + 21/1680 = 400 + 21/1680 = 421/1680
5. So, 20/84 + 1/80 = 421/1680

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