Answers

Add 25/42 and 84/80

1^st number: 25/42, 2^nd number: 1 4/80

25/42 + 84/80 is 691/420.

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,
   25/42 = 25 × 40/42 × 40 = 1000/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   84/80 = 84 × 21/80 × 21 = 1764/1680
4. Add the two like fractions:
   1000/1680 + 1764/1680 = 1000 + 1764/1680 = 2764/1680
5. 2764/1680 simplified gives 691/420
6. So, 25/42 + 84/80 = 691/420
   In mixed form: 1271/420

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