https://www.education.com/lesson-plan/number-recognition-1-10/
动画
https://www.youtube.com/watch?v=eMvwp930aIE
各类app
https://play.google.com/store/apps/details?id=com.preschool.kidsmathgames
数学游戏
https://www.zhihu.com/question/33536588
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