3.1415926535 are the ones I remember

3.1415926, I'm a scrub

the manual for my calculator said it had pi defined as 3.1415926390 but it only displayed 3.14159264 and for some reason that stuck

3.1415 unless i got that wrong

I used to know 40, now I just know 3.141592653589626433 or something like that I probably got it wrong.

pi=3

3.141592(6 I think?)

3.1415926535898 (last digit there is really a 7, but rounds to 8)
as many digits as my calculator had when i was bored in school

4 digits after the comma.

2-3

1. It's the best choice.

3.1415926536

3.1415, 4 digits more than you need for most applications so

8

three of them