闯关游戏,9+（ ）=10,9+（ ）=11,9+（ ）=12,9+（ ）=13,9+（ ）=14,9+（ ）=15,9+（ ）=16,9+（ ）=17,9+（ ）=18,1,2,3,4,5,6,7,8,9,你发现哪些数学信息？你能提出什么数学问题？,买铅笔,加与减（一）,1根1根,先减一部分再减,想加算减,计数器,还剩几枝铅笔？,一根一根的减,分开减再加,先减一部分再减一部分,9 + 6 = 15,15 9 = 6,想加法算减法,运用计数器计算,4,7,10 9 = 11 9 = 12 9 = 13 9 = 14 9 = 15 9 = 16 9 = 17 9 = 18 9 = 19 9 = 20 9 =,1,2,3,4,5,6,7,8,9,10,11,你能发现什么？,10 9 = 1 12 9 = 3 15 9 = 6 18 9 = 9 13 9 = 4 11 9 = 2 16 9 = 7 14 9 = 5 20 9 = 11 17 9 = 8 19 9 = 10,我的发现,打乱顺序你又能发现什么？为什么？,
