数字困境（+ - ）一个大问题，从小学IR解决游戏活动。
Gameplay: Drag and drop the digit cards to complete the number sentences. Digit Dilemma features five levels of difficulty which, as well as reinforcing addition and subtraction facts, promotes problem solving skills. Level Five will challenge the most able!
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- contain no in-app purchases.
- contain no third party advertisements.
- do not link to any form of social media.
- do not collect, store, or share any type of personal information or location data.
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