Forget the stats and calculus. Think carpentry, measuring and cutting wood products. If you are building things in the US/UK/Canada then you are using feet and inches. 12 inches to a foot. It's a tiny thing to learn and will serve kids well in any number of professions.
Now 11, that's a total mystery. Other than it being between 10 and 12, I see no reason to memorize 11s.
Now 11, that's a total mystery. Other than it being between 10 and 12, I see no reason to memorize 11s.