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Let's Investigate Triangles

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Noah saw 12 legs walk by into the Ark. How many creatures did he see?

Strike it Out

Stage: 1 and 2 Challenge Level: Challenge Level:1
It's a good idea to play the game lots of times to start with to get the feel of it.
You could keep the lines you use for each game and compare them afterwards. Are there any numbers that you haven't crossed off in any of the games you've played? Is it possible to cross them off?