Answers

Add 25/81 and 4/40

25/81 + 4/40 is 331/810.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 40 is 3240
   
   Next, find the equivalent fraction of both fractional numbers with denominator 3240
2. For the 1st fraction, since 81 × 40 = 3240,
   25/81 = 25 × 40/81 × 40 = 1000/3240
3. Likewise, for the 2nd fraction, since 40 × 81 = 3240,
   4/40 = 4 × 81/40 × 81 = 324/3240
4. Add the two like fractions:
   1000/3240 + 324/3240 = 1000 + 324/3240 = 1324/3240
5. 1324/3240 simplified gives 331/810
6. So, 25/81 + 4/40 = 331/810

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