Answers

Add 20/42 and 3/80

20/42 + 3/80 is 863/1680.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 80 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 42 × 40 = 1680,
   20/42 = 20 × 40/42 × 40 = 800/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   3/80 = 3 × 21/80 × 21 = 63/1680
4. Add the two like fractions:
   800/1680 + 63/1680 = 800 + 63/1680 = 863/1680
5. So, 20/42 + 3/80 = 863/1680

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