/sci/ - Science & Math

Wich methods are the best to divide something(with big and small numbers)? I always forget how to make a simple division, I can do 10/2 easy, but 10/3 I quite didn't grasp the rules yet how to calc it correctly, somehow is easier to understand the Σ than a simple 264,28÷0,3, and Idk also how to use irrational numbers in math operations(maybe that's the main problem that makes me unable to do division correctly, also, I can calc √4(2) but not √5(2.23606798?? O_O))