1、9+6=,9+7=,9+3=,15,16,12,9+8=,17,9+4=,13,9+5=,14,9+2=,11,9+（ ）=12,3,开火车,有 15 个气球， 卖了 9 个。,还有几个?,15-9=?,15,15 9=,6,一 个 一 个 的 减,方 法 一：,10,2,3,1,方法二；破十法,15 9 =,6,5,1,10,+,10 9 = 1 1 + 5 = 6,想：,9+6 =15,15-9=6,因为：,所以：,6,7,+ =,因为：,所以：,169 =,- =,7,方法三；做减想加法,12 9 =,想： 9+( )=12,所以 12-9=,3,3,3,139,8,3,7,5,2,4,
2、6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,16
3、9,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,179,129,119,169,139,189,11 9 = 2,12 9 = 3,13 9 = 4,14 9 = 5,15 9 = 6,16 9 = 7,17 9 = 8,18 9 = 9,仔细观察，你发现了什么？,11 9 = 2 12 9 = 3 13 9 = 4 14 9 = 5 15 9 = 6 16 9 = 7 17 9 = 8 18 9 = 9,仔细观察，你发现了什么？,11 9 = 2,12 9 = 3,13 9 = 4,14 9 = 5,16 9 = 7,17 9 = 8,18 9 = 9,得数只要看十几的个位是几，得数就是比几多1,19 9 = 10,144=,10,57=,12,95=,9 7=,86=,56=,9 6=,1061 =,1553=,14,15,14,16,11,5,7,=,给、或=找个家 。 12-9 4 11-9 11+913-3 13-9 18- 9 9,课堂小结：今天学了什么？是用什么方法来做的？,再 见,
