I know nothing about baseball, cricket and American football, they’re practically non-existent here. Basketball and soccer are full of numbers? For 3-4 years old they are. Maybe there could be some lessons for older kids, I just can’t think of how to spin it that way.
A month ago I told him an old and tired joke. 90 degrees is a right angle, and 100 degrees is when water boils (celsius FTW). He howled with laughter and sure knows now some things about angles and circles.