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1、用计算器计算练习,算一算,找规律,框一框,读一读,(1) 678795 (2) 90231186 (3) 457142 (4) 862456,复习:用计算器计算,复习:用计算器计算,1、比一比,看谁算得又对又快.,34,357,9018,48,2922,34,125,3840,12138,3120,65,918,27,3375,练习:,练习1比一比看谁算得又快又对,2. 用计算器计算.,948647 (3945477)57 845025249 6396(520438),练习2用计算器计算,3.用计算器计算，并找一找各组的规律。,9 9 1 =,98 9 2 =,987 9 3 =,9876 9
2、 4 =,80,880,8880,88880,练习3计算并找规律,9 9 1 =,98 9 2 =,987 9 3 =,9876 9 4 =,80,880,8880,88880,练习3计算并找规律,9 9 1 =,98 9 2 =,987 9 3 =,9876 9 4 =,80,880,8880,88880,9 9 1 =,98 9 2 =,987 9 3 =,9876 9 4 =,80,880,8880,88880,9 9 1 =,98 9 2 =,987 9 3 =,9876 9 4 =,98765 9 5 =,987654 9 6 =,9876543 9 7 =,98765432 9 8
3、 =,80,880,8880,88880,888880,8888880,88888880,888888880,总结,19 + 99 =,118 + 989 =,1117 + 9879 =,11116 + 98769 =,111115 + 987659 =,1111114 + 9876549 =,11111113 + 98765439 =,111111112 + 987654329 =,100,1000,10000,100000,1000000,10000000,100000000,1000000000,进一步计算找规律1,129- 8 =,1239- 7=,12349- 6=,123459-
4、5=,1234569- 4=,12345679- 3=,123456789- 2=,1234567899- 1=,100,1000,10000,100000,1000000,10000000,100000000,1000000000,进一步计算找规律2,（10-1） 9=,（200-2） 9=,（3000-3） 9=,（40000-4） 9=,（500000-5） 9=,（6000000-6） 9=,（70000000-7） 9=,（800000000-8） 9=,1,22,333,4444,55555,666666,7777777,88888888,进一步计算找规律3,应用题1,应用题1分析
5、,应用题2,1 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 31,15,14,9,16,18,10,11,21,22,23,应用题2分析,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 31,14,14,9,16,18,10,11,21,22,23,应用题2分析,1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
6、22 23 24 25 26 27 28 29 30 31,16,14,9,16,18,10,11,21,22,23,应用题2分析,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 31,18,14,9,16,18,10,11,21,22,23,应用题2分析,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 31,9,14,9,16,18,10,11,21,22,23,应用
7、题2分析,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 31,10,14,9,16,18,10,11,21,22,23,应用题2分析,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 31,11,14,9,16,18,10,11,21,22,23,应用题2分析,1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 2
8、2 23 24 25 26 27 28 29 30 31,21,14,9,16,18,10,11,21,22,23,应用题2分析,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 31,22,14,9,16,18,10,11,21,22,23,应用题2分析,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 31,23,14,9,16,18,10,11,21,22,23,应用题2分析,扩展资料,
