I chose this gizmo because it looked like a good way of practicing prime factoring composite numbers. The gizmo randomly selects a composite number and the students pick factors of that number to find the prime factors. You can work on multiple prime factorizations and compare them to possibly use for finding the greatest common factor.
I think I would use this in my classroom because the gizmo can be used for many different lessons, like greatest common factor for example. I also think that it can be a great tool for reinforcing what a prime number and a composite number is.
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