Here's how you can perform complex division, multiplication, root or power without a calculator using log tables. The basics.
log(a*b)=log a + log b.
Therefore to multiply two numbers, say 2.34 * 8.76 find log of both the numbers. Add the log values. And then find inverse log of the answer to get the answer. As adding two numbers is 100 times easier than multiplying both.
Now again, multiplication can be handled w/o a log table. But division is tough.
log(a/b)= log a - log b.
Find log of two numbers, subtract both and anti-log for answer.
And this helps the most with powers and roots.
log (a ^ b) = b * log a
Simply find log of the base number, multiply by its power and anti-log.
Square root?
sqrt(x) = x ^ (1/2) apply the power formula again.
next/Examples.
- Comments:
- Pic of settings.
- কোন এন্টিভাইরাস?