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一、游戏导入师:同学们,喜欢做游戏吗?我们一起玩报数游戏。1.你能报出一个十位上的数比个位大2的两位数吗?(生答略)2.提高要求。(1)你能报出十位上比个位上大7的两位数吗?看谁报得多?(2)你能报出十位上比个位上大8的最大两位数吗?(3)能告诉老师为什么想得这么快吗?设计意图:注意激发学生学习探究的热情,并为后面的学习作铺垫。二、探索规律1.观察特点。认真观察,下面这些算式有什么相同点?
First, the game import division: Students, like to play the game? We play together the number of games. 1. Can you quote a double digit higher than the number of digits in the tens place? (1) Can you report the double digits of the top 10 on the top 10? See who is better at it? (2) Can you report the top 10 digits on the top 10? (3) can tell the teacher why think so fast? Design intent: pay attention to stimulate students enthusiasm for learning to explore and pave the way for the study behind. Second, explore the law 1. Observation features. Observe carefully, what are the same for these formulas below?