Use logarithms.
If you need to find x in:
then
Note: On a calculator use log(y)/log(2) to get
The questions you are asking is .
Simplify this into .
Then .
Hi all,
i'm not a mathematician therefore I need help! is there a calculation that determines how many times a smaller number has to be doubled to achieve a larger number? also will it work where doubling a number doesn't exactly fit into the larger number?
for example I know that 10 doubled three times equals 80 but is there a calculation where we know of 10 & 80 but it calculates that 10 needs to be calculated 3 times?
Cheers for any help!
Morgan
If you use something like Excel, then they have the logarithm function.
I think it is in Insert -> Function -> Math and Trig functions -> log
Then if you want to see how many times A needs to be doubled for B type
= log(B/A)/log(2)
where "/" is division
and "log(...)" is any log function in Excel.
It may give you decimals if it is not exactly double.