As an example from my life, my 8 year old learned how to calculate perimeter and area this year. The cool thing about area of a rectangle is you can just turn

As an example from my life, my 8 year old learned how to calculate perimeter and area this year. The cool thing about area of a rectangle is you can just turn it into a multiplication array. Which is something they learned to help them understand multiplication. If she just memorized multiplication, she wouldn't actually understand the formula.