How to solve 10^-4.30 without a calculator

Question

How to solve 10^-4.3 without a calculator. Step by step needed please

Answer 1

without a calculator, you can try using common logarithms, the way we did in high school & college in the 1950s.

 

Believe me, you don't want to go there; we carried little green books of logarithmic tables and a sure supply of scratch paper.