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 ...

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It’s the attention to detail that often differentiates a good product from a great product, but designer Norihiko Terayama goes above and beyond the call of duty with his f,l,o,w,e,r,s ruler, which ...

How accurate you need to be when you measure depends on the situation. To measure and draw well, you need to know how to use a ruler and understand the different units of measurement, such as ...

The length of an object is the distance from one end to the other. Height measures how tall an object is. You can measure lengths or heights using centimetres and metres. The height of a plant would ...