九九乘法 - 兒童小練習

家裡有小朋友剛好在練習九九乘法，
受到網友的啟發，
做了這個簡單的九九乘法練習 APP，
希望幫小朋友輕鬆練習九九乘法。 Some of the kids at home just practicing Jiujiuchengfa,
Inspired by users,
Do this simple exercise Jiujiuchengfa APP,
Hope to help children practice Jiujiushengfa easily.