The amazing calculator that shows the answer only when you also enter a suitable mental estimate

24 12 2013

This calculator doesn’t give you the answer until you have given a solution close to the actual answer.
I plan to have it as part of the problem solving activities in my 2014 classes.
The other feature I like is that you need to enter all the operations. This reinforces when multiplication is actually being done and assists the understanding of inverse operations, when necessary.

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