Answers

Add 16/42 and 9/80

16/42 + 9/80 is 829/1680.

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,
   16/42 = 16 × 40/42 × 40 = 640/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   9/80 = 9 × 21/80 × 21 = 189/1680
4. Add the two like fractions:
   640/1680 + 189/1680 = 640 + 189/1680 = 829/1680
5. So, 16/42 + 9/80 = 829/1680

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