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 ...
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 ...
TLDR: The Rollova 2.0 Digital Ruler slips into your pocket and springs to life to measure over any surface, even curves, with just a simple roll. While the wooden ruler is best remembered as the ...
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