I want to end liken Albert Einstein

you do not need to be able to do calculus in order to do math or physics

I agree, but what if I really want to?

to do it in your head? multiplication alone past multiplying 3-digit numbers is cumbersome

but there are numerous compensatory methods:

• knuckles
• pen and paper
• quipu
• and more modern - calculator :D

I've never bothered with trying to do more then multiplying 3-digit numbers because it takes time and it is prone to mistakes, so it is not a prudent method,

btw if you take your NAS number and divide by 4 you will get prime number 18419

Multiplication is just boring and repetitious

Division of 3+digits numbers - that is something chalenging actually to do it in your head

Or finding roots

But again it's a mental excercise for few hours long travel for example, not to employ when you need something calculated.

But the choice exists only when you know both

Multiplication is just boring and repetitious

Division of 3+digits numbers - that is something chalenging actually to do it in your head

Or finding roots

But again it's a mental excercise for few hours long travel for example, not to employ when you need something calculated.

But the choice exists only when you know both