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Curious Ruler

Reviewed on 11/17/14

How many pennies wide is a cereal box?  How many basketballs tall is your best friend? Explore comparative measuring (and learn the actual measurements) using this app.  Simply choose a reference item from their list (standard coins and paper money, sports balls, credit cards, even LEGO bricks are included in their options!), then take a photo of the reference item with the object that you want to measure.  Slide the guides to the top and bottom of your reference object and the target object and then click on "compare" to see how it measures up. A simple and unique way to learn more about the mathematical concept of measurement. (Paid version is ad-free, but if you'd prefer the free version with ads, click here)

Age group: Grades K-2, Grades 3-5
Topics: Concepts, Math