"10"和"20"是兩個關鍵數,讓小朋友突破加法的計算技巧,"合10達人"便是訓練小朋友數字組合和速算的最好玩遊戲! 10 and 20 are the two key numbers in mastering addition. “10 Maker” is an interactive game specifically designed to develop children’s understanding of the composition of 10 and 20.