Question

How do we calculate log 7 mentally??

Answer 1

In the thread about calculating higher powers 8, we talked about the importance of logarithms.

In my view this is one of the key skills in mental calculation.

It makes a lot of difficult calculations easier.

For example:

Taking the square root of a number becomes division by 2.

Multiplication becomes addition.

Any power of a number can be found by multiplication.

Etc., etc.