Hi A.M.,

I can definitely help you with this issue. The reason why you are getting a negative value when using the BIN2DEC function in Excel is because the function is treating the binary number as a signed integer. This means that if the leftmost bit of the binary number is 1, the function will interpret it as a negative number.

To convert large binary numbers correctly in Excel, you can use a combination of functions. Here are the steps:

1. Split the binary number into groups of 10 digits, starting from the rightmost digit. For example, for the binary number
   Formula:

   1100110110 

   , you would split it into
   Formula:

   001100110 

   and
   Formula:

   110 

   .
2. Convert each group of 10 digits to decimal using the BIN2DEC function. For the example above, you would get 204 and 6.
3. Multiply each decimal value by 2 to the power of its position, starting from 0 for the rightmost group. For the example above, you would get
   Formula:

   204 x 2^0 = 204 

   and
   Formula:

   6 x 2^10 = 6144 

   .
4. Add up all the results from step 3. For the example above, you would get
   Formula:

   204 + 6144 = 6348 

   .

That's it! By following these steps, you can convert large binary numbers correctly in Excel. Let me know if you have any questions or need further clarification.

Best regards,
[Your Name]