By the times you get up to 11 or 12 on the times table you’ve already learned up to 10 so it’s just a matter of learning four more. That was drilled into us by the 3rd grade.
I’d be happy if the kids could learn decimals by the time they leave high school. You would be shocked at the number of college kids who can’t answer the following question:
Which if the following is the largest:
a. .1
b. .01
c. .019
Many kids will say .019 and when you ask them why they say “Because everything works backwards to the right of the decimal.” Huh???