Keke practices math online after shcool every day.

This is an assignment by her teacher.

The first day when she was working on it, 非常有趣。 一道加法必須在有限時間答完，可可手指頭飛快的動著，十以上的加法在拚命的數加幾個。 後來熟悉些了，盡管不明顯了，手指頭也在悄悄的動。