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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,复习:,9+5=14 9+3=12 8+5=13,7+6=6+7=8+4=12,6+9=15 7+8=8+7=,13,13,15,15,5 +7 =,5 +8 =,怎样想能很快说出得数?,5 +7 =,5 +8 =,7 +5 =,3,2,10,12,8 +5 =,2,3,10,13,12,13,4 +8 =3 +9 =,4 +7 =3 +8 =,4 +9 =5 +6 =,12,11,13,12,11,11,5 +7 =7 +5 =,5 +8 =8 +5 =,4 +8 =8 +4 =,3 +9 =9 +3 =,12,13,12,12,交换加数的位置,得数不变。,=,=,6,+,5,11,5,+,6,11,=,=,4,+,7,11,7,+,4,11,算一算每一种体育用品有多少?,一班有,二班有,一共有,7个,5个,4条,6个,8个,7条,13,个,13,个,11,条,1、竖着看,各列是怎样排列的?,2、横着看,各行是怎样排列的?,3、你还发现什么有规律的排列?,2,+9,3,+8,4,+7,5,+6,3,+9,4,+8,5,+7,4,+9,5,+8,5,+9,
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