选择从3个级别划分款项从基本到三个数字的问题。它包括的问题,其中有一余数。每个总和随机产生一次在黑板上风格界面。音频和视频的鼓励让你知道当你是对的,当你需要再次尝试的。有一个工厂打印出来和/或保存个性化的证书,以鼓励改善。...
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