• Apr 20th 2012, 07:56 PM
Past45
When I use a calculator to log 8, I get .903089986991944, and i am suppose to take four numbers after the decimal. So, I get .9030... However the answer is suppose to be .9031. I have noticed that a lot, the last number seems to always be 1 number lower(the 4th number after the decimal). Is that common?
• Apr 20th 2012, 09:24 PM
biffboy
The rule is: If asked for 4 decimal places look at the 5th figure. If it is 5 or more put the 4th number up by 1

This example should explain. Write 3.68 correct to one decimal place. The answer is 3.7 because 3.68 is nearer to 3.7 than it is to 3.6
• Apr 21st 2012, 10:08 AM
Wilmer
x = the number (.903089986991944)
n = number of digits after decimal point (4)

x = |x*10^n + .5| / 10^n ; that'll give you .9031

By the way, your question has really nothing to do with logs;
• Apr 21st 2012, 01:42 PM
Past45
Quote:

Originally Posted by biffboy
The rule is: If asked for 4 decimal places look at the 5th figure. If it is 5 or more put the 4th number up by 1

This example should explain. Write 3.68 correct to one decimal place. The answer is 3.7 because 3.68 is nearer to 3.7 than it is to 3.6

Ty