My elementary school had an interesting practice here, starting at the end of the 6th grade you could take a calculator drivers license test, which once passed

My elementary school had an interesting practice here, starting at the end of the 6th grade you could take a calculator drivers license test, which once passed allowed you to use your calculator on any assignment. The test had two components, the first required you to demonstrate an ability to do estimation, that you had a general understanding of the scale of numbers following various operations, and the second required you to perform the actual calculations.