Why is there a difference between these two numbers?

[convo_king89]

if you count with your fingers 1 through 5 it’s 5, but if you do 15 through 20 it’s 6. It’s seems super basic

[TrueConfection]

Because you started with 1 and not zero in the first instance.

[In_Trance]

There's a difference because you're counting six numbers versus five

[Jennz6]

I’m not good at arithmetic, even if I use my fingers

[petitedollbabee]

Because we don’t count zero when counting 1 to 5.