The subtracting decimals gizmo was very interesting! I loved how you could adjust the place values that you used in the subtraction. It was very visual and I like how you can move the base 10 blocks and see on the side how much you have and how many you take away. It will also show the difference of how many blocks you took from the top and it will show the difference on the side where it has the numerical arithmetic.
I would definitely use this in a lesson to model three digit subtraction with or without decimals. Although, I do wish that you could use more or less than 3 digit numbers. I do think that it is a good visual alternative if a classroom doesn't have base 10 manipulatives. However, you could use the base 10 blocks along with this if you have them.
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