I remember when I was a kid at school and the teacher first taught us how to round numbers. The technique he taught us is known as arithmetic rounding, also called round-half-up. In this case, values ...

Editor's Note: I just thought I should mention that there's an ongoing, ever-evolving, and dramatically different presentation of this topic entitled Rounding 101 on my personal website. We'll start ...

Use place value cards to practice rounding numbers to the nearest ten and hundred. Warm up with a Mystery Math Mistake to hunt for the mistake made counting up on the number line. Use place value ...