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 ...

Since the scale line of a general ruler has a width, many people have had the experience of trying to draw a line of the correct length with a ruler and wondering 'how far should I draw this scale ...

Your smartphone can not only serve you as a digital ruler, but it can also help you measure various other things. Smartphones are very powerful tools, especially if you pair them up with good apps. In ...