Interesting that is 3rd grade at 9-10. 10 year olds in the US are typically in 5th grade. What ages do earlier grades align to?

Generally in the US it is:

* K ~5 yo

* 1st ~6 yo

* 2nd ~7 yo

* 3rd ~8 yo

* 4th ~9 yo

* 5th ~10 yos

Give or take of course since birthdays don't align perfectly.

That seems to roughly align to US standards for the same age but not the same grade.