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【片段1】自主数出计数单位“百”师:(出示图1)请小朋友数一数,这样的一条,由几个小正方体拼成?图1生:10个。师:10个一是一十。(板书:10个一是一十。)师:(出示图2)猜猜这样的一片有多少个小正方体?数一数到底有几个?生:100个,我一个一个数出来的。生:可以十个十个地数,有100个。师:九十下来怎么不是十十呢?生:进位!满十进一。师:(板书:满十进一)满十就产生一个新的计数单位,10个十
[Fragment 1] Autonomous count the number of units “Bai ” division: (Figure 1) Please count the number of children, such a piece, composed of several small squares? Teacher: 10 one is ten. (Blackboard: 10 one for ten.) Teacher: (Figure 2) Guess how many such a small cube? Number in the end there are a few students: 100, I count them out one by one. Students: Ten to ten places, 100. Teacher: Why is not ninety ten down? Health: Carry! Full ten into one. Teacher: (blackboard: full of ten into a) full of ten to produce a new counting unit, 10 ten