book Maths Puzzle Numerical Ability

How do I round 0.00000226 to the nearest tenth,hundred ,thousand?

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book Other Question

When we have an equation of logarithms how do we work to solve it?(is that the right way or not?)Write a methodology please...
for ex:

log3x + log(x+5) = log(X^2+4x)/X>0,X different from 0 if 5 x 10n = 0.005, then n=