Excel drag-formula not working

Question

I have a "subscription" column in column A. A1 is "12000". I want C1 to be "A1/12" AND D1 to be "A1/12". However, if I make the formula for C1 "A1/12" and then drag to the right, D1 will try to become "B1/12" which I DO NOT WANT.

I do not just want to make A1 a constant, because I want that when I copy and paste this onto the following rows, C2 and D2 should be "A2/12" and NOT "A1/12".

Thoughts? Sorry for the obfuscated explanation.

Answer 1

Just lock the cell. This is done with dollar signs, or when you put the reference, press F4.

=$A$1/12

And you can drag it without the formula changing the A1.

If you want it to change with changing rows, just lock the column A:

=$A1/12

Answer 2

Use the dollar sign to fix the reference:

=$A$1/12

You might want to have a look at this for more information

http://www.notjustnumbers.co.uk/2011/05/excel-tip-dollar-sign-in-formula-fixing.html