《用计算器探索规律》教学课件.ppt

小数除法,用计算器探索规律,0.3636,411,0.4545,511,复习旧知,用计算器计算下面各题。,1110.0909,2110.1818,311,0.2727,探索新知,1110.0909,2110.1818,3110.2727,4110.3636,5110.4545,你发现了什么规律？,它们的商都是循环小数。,1110.0909,2110.1818,3110.2727,4110.3636,5110.4545,循环节是09,循环节是18,循环节是27,循环节是36,循环节是45,你还发现了什么规律？,探索新知,不计算，用发现的规律直接写出下面几题的商。,611,0.5454,711,0.6363,811,0.7272,911,0.8181,想一想8 11的商是多少？,你是怎么想出9 110.8181 这个答案的？,探索新知,知识应用,60.7,6.66.7,6.6666.7,6.666666.7,1.不计算，运用规律直接填出得数，再用计算器验算。,4.2,44.22,444.222,4444.2222,猜猜6.66 66.7的积是多少？你是怎么想的？,想一想6.666 666.7整数部分有几个4，小数部分又是多少？,37,3.36.7,3.3366.7,3.333666.7,3.33336666.7,3.3333366666.7,21,22.11,222.111,2222.1111,22222.11111,222222.111111,你能用发现的规律接着写出下面一个算式吗？,2. 用计算器计算前4题，试着写出后2题的积。,知识应用,17,27,37,47,57,67,0.142857142857,0.571428571428,0.714285714285,0.857142857142,0.285714285714,0.428571428571,3. 用计算器计算下面各题。,知识应用,布置作业,作业：第37页练习八，第12题。,