Answers

Add 12/84 and 25/40

12/84 + 25/40 is 43/56.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 40 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 84 × 10 = 840,
   12/84 = 12 × 10/84 × 10 = 120/840
3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
   25/40 = 25 × 21/40 × 21 = 525/840
4. Add the two like fractions:
   120/840 + 525/840 = 120 + 525/840 = 645/840
5. 645/840 simplified gives 43/56
6. So, 12/84 + 25/40 = 43/56

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