# Thread: Adding Hex Numbers

1. ## Adding Hex Numbers

Hi Guys!

This problem is relatively easy, but I can't help but think I am doing something wrong. Basically, I am checking some binary work by adding Hex numbers. The numbers are
4F1A5 and BD50. I used a calculator to find the answer to be 50A7A,but when I do it manually, I get 5AA7AA, which is wrong. Could anyone tell me what I am doing wrong?

This is what I did:

4F1A5 => 4 15 1 10 5
BD50 => 0 11 8 13 5

4 15 1 10 5
+ 0 11 8 13 5
---------------------
4 26 9 23 10
---------------
5 10 10 7 10 < -- There are carries in here, but I don't know how to show it on the computer
----------------------
5 A A 7 A < -- My Answer

* It looks clearer in the picture.

2. ## Re: Adding Hex Numbers

units digit: 5 + 0 = 5
tens digit: A + 5 = F
hundreds digit: 1 + D = E
thousands digit: F + B = 1A, so keep the A and carry the 1
ten-thousands digit: 4 + 1 (carried from the thousands digit) = 5

So your answer: 4F1A5 + BD50 = 5AEF5. Both the answer you were given and your answer are wrong.

3. ## Re: Adding Hex Numbers

Originally Posted by Prove It
units digit: 5 + 0 = 5
tens digit: A + 5 = F
hundreds digit: 1 + D = E
thousands digit: F + B = 1A, so keep the A and carry the 1
ten-thousands digit: 4 + 1 (carried from the thousands digit) = 5

So your answer: 4F1A5 + BD50 = 5AEF5. Both the answer you were given and your answer are wrong.

Sorry, the second number isn't BD50 it's B8D5.

4. ## Re: Adding Hex Numbers

Originally Posted by cdosrun01
Sorry, the second number isn't BD50 it's B8D5.
You can check answers here.

5. ## Re: Adding Hex Numbers

Originally Posted by cdosrun01
BD50 => 0 11 8 13 5 = BD55
Which is it? And in any event BD50 = (11)(13)(5)(0).

-Dan

6. ## Re: Adding Hex Numbers

To Topspark:
The second number is B8D5 not BD50, that was a mistake on my part. The numbers associated with it are correct ( i think ) as it correlates to the hex equivalent of that digit (e.g B = 11, 8 = 8, D = 13, etc)

To Plato,

Thanks for the wolfgram. Apparently one of the binary numbers were wrong.

Thanks for the replies!

7. ## Re: Adding Hex Numbers

4F1A5 + B8D5

Units digit: 5 + 5 = A
Tens digit: A + D = 17, so keep the 7 and carry the 1
Hundreds digit: 1 + 8 + 1 (carried from the tens digit) = A
Thousands digit: F + B = 1A, so keep the A and carry the 1
Ten-thousands digit: 4 + 1 (carried from thousands digit) = 5

So 4F1A5 + B8D5 = 5AA7A.

8. ## Re: Adding Hex Numbers

Originally Posted by cdosrun01
To Topspark:
The second number is B8D5 not BD50, that was a mistake on my part. The numbers associated with it are correct ( i think ) as it correlates to the hex equivalent of that digit (e.g B = 11, 8 = 8, D = 13, etc)

To Plato,

Thanks for the wolfgram. Apparently one of the binary numbers were wrong.

Thanks for the replies!
Sorry about that. I somehow missed the correction you made above.

-Dan

9. ## Re: Adding Hex Numbers

Why you add hex manually...
use the build in calculator with your windows...
just set it to HEX...as simple as such...

10. ## Re: Adding Hex Numbers

Originally Posted by MINOANMAN
Why you add hex manually...
use the build in calculator with your windows...
just set it to HEX...as simple as such...
I'm one of those annoying people that believe knowing how to do a thing should precede doing it on a calculator. A calculator is a tool, and a nice convenience, but if you need to check your work you will need to do it manually. I can't count the number of times a member here misentered a calculation and didn't know how to check it.

Here's a good example. The integral of 1/x is ln|x|, not ln(x). Even Wolfram calculations need to be checked.

-Dan