奇玩星的遊戲幫孩子「看懂」進位、退位和乘法的意思；這裡練的是「不用想就答得出來」。每天 5 分鐘、大約 30 題，孩子自己按數字鍵輸入答案。每一題各自記熟練程度：答對而且夠快，隔幾天再出來複習；答錯或太慢，當天過幾題就再練一次，每天只加幾題新的（間隔重複）。一題在不同的天都答得又對又快，那塊磁磚才會全亮，所以要每天練一點，不是一次練很久。
練習線：湊十（大班～一年級）、20 以內加法和減法（一～二年級）、九九乘法（二～三年級），依孩子選的年級先開。多快算「熟練」預設依年級（一年級 5 秒、二年級 4 秒、三年級以上 3 秒），家長可以在家長專區調整。免費、無廣告、不用註冊，紀錄只存在這台裝置。
WonderPlay’s games help children understand carrying, borrowing and multiplication; this page builds instant recall. About 30 questions in 5 minutes, typed on a number pad. Each fact keeps its own record: right and quick facts come back a few days later, wrong or slow ones come back a few questions later the same day, and only a few new facts are added each day (spaced practice). A tile is fully lit only after the fact is right and quick on several different days, so a little every day works better than a lot at once.
Tracks: pairs to 10 (kindergarten to Grade 1), adding and subtracting within 20 (Grades 1–2), times tables (Grades 2–3). How fast counts as fluent follows the grade (5 s in Grade 1, 4 s in Grade 2, 3 s from Grade 3) and can be changed on the parent page. Free, no ads, no sign-up; records stay on this device.