Create your own centimeter ruler. Then, estimate and measure with lengths with it. Warm up with a Mystery Math Mistake as you add two 2-digit numbers using a decomposition strategy. Think through ...

Making a sensible guess or a rough calculation is known as estimation. An estimate is not an exact calculation. You can use estimation when you do not need to know an exact number or you can use it to ...

In statistics, data collection is a difficult process that demands thoughtful consideration. Securing a sufficient sample size can be challenging, or even impossible, regardless of the method employed ...

It's easy to not think about how little expenses add up over the course of an entire year. Use this simple mental calculation to quickly estimate the yearly expense and think about what better use ...