This gizmo is another great for a maximum of three digit subtraction. It uses a space cargo ship and you have to fill up as many barrels as you want and lock them in place. It is also in a base 10 format so the way that it is set up isn't confusing to a child that hasn't used it before. It is great for teaching to regroup and reinforces place value as you "unload" the barrels to various planets. I also like how it shows you how many you have left when you have unloaded the barrels both visually in the ship, and numerically in the cargo status section.
Like the previous subtraction gizmo, I would like to see more than three digits for more advanced students. However, I do think that this is a great tool to model subtraction up to three digits without using base ten. I think I would use this gizmo in my classroom because it is very game-like and I think students would enjoy that. Also, again, because it reinforces place value and using "holds" as hundreds, "crates" as tens, and "single barrels" as ones.
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