Free only in November.

This is a virtual manipulative to support developing number sence and arithmetic concepts.

Watch a video of the app: http://www.youtube.com/watch?v=9bPtA8lkXt4

Two (sub-)quantities together result in a new total quantity. This is called addition. And if you take away a subquantity, another subquantity remains. This is called subtraction. With this virtual manipulative kids kann explore and learn the relationsships between subsets and total sets. This is how it works:

Touch the screen with your fingers to produce token. You can also move these tokens with your fingers.

Link: Download

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