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1、數(shù)花生,北師版一年級數(shù)學下冊,會有多少顆花生米,先思考一下能怎樣數(shù),個人任務,都有哪些方法數(shù)數(shù),如何更快地數(shù)數(shù),小組任務,要求: 小組討論好如何數(shù)：人撥計數(shù)器，其它人負責數(shù)花生，一計數(shù)器撥的數(shù)量要和花生數(shù)量一樣,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68

2、,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,一個一個地數(shù),1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,

3、69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,兩個連個地數(shù),1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,6

4、9,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,五個五個地數(shù),1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69

5、,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,十個十個地數(shù),數(shù)數(shù)時要注意,計數(shù)器撥法】 個位滿十向十位進一， 十位滿十向百位進一,100是三位數(shù)，從右邊數(shù)起第三位叫百位,拓展：感受數(shù)量100,2個班級,課本23頁 第2題,3.在下面各數(shù)的后面，連續(xù)數(shù)出五個數(shù)來,二十三 五十六 七十七 八十九 九十五,二十四 二十五 二十六 二十七 二十八,五十七 二十八 二十九 三十 三十一,七十八 七十九 八十 八十一 八十二,九十 九十一 九十二 九十三 九十四,九十六 九十七 九十八 九十九 一百,4.圈一圈，數(shù)一數(shù),你學到了什么,100以內(nèi)數(shù)的數(shù)法