Answers

Add 25/84 and 42/80

25/84 + 42/80 is 691/840.

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,
   25/84 = 25 × 20/84 × 20 = 500/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   42/80 = 42 × 21/80 × 21 = 882/1680
4. Add the two like fractions:
   500/1680 + 882/1680 = 500 + 882/1680 = 1382/1680
5. 1382/1680 simplified gives 691/840
6. So, 25/84 + 42/80 = 691/840

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