My DS is also in pre-primary (yep same as Kindy in NSW) and in his school they will know counting to 100 (and over) 2 times tables to 20 (DS taught himself past 100 just by playing basketball!), 5 times tables to 50, basic addition (DS does number sentences). He can also do it all in his head, which is way better than I can do!

Everyone in his class are at different stages though. I do think my DS is also a genius! Probably because he rocks at maths and I was always so bad at it!

Sounds like you have every reason to think he's totally amazing