Do your students do lots of arithmetic while doing important mathematics?
Are your students learning how to find patterns?
Are your students able to visualize -- draw a picture or diagram, or graph -- the problem they are working on?
Are your students making up their own math problems?
Are your students encouraged to ask questions about math?
Are your students enjoying doing mathematics?
Are your students solving each problem (like 64 - 28 = ?) in many different ways?
Are your students learning how to learn?
Are your students thinking about their mathematical thinking?

(adapted from the Mathman Don Cohen)