"Six plus two are eight"?
Added "plus". Frankly, "plus" in Polish would also be... more mathematical (and is accepted).
Great! Dziękuję bardzo!
You are not accepting "6+2=8"???
Numbers in English are accepted automatically, so we don't have to think of that - apparently, + or = are not. Added, then.
Normal speed, I hear "dwa", slow speed, I hear "wa"
I guess the male slow audio has 'd-' so quiet, that it's almost unhearable. It's not easy to fix though, I'm afraid :|