题目内容
计算下面各题,看看计算结果有什么规律. 21×9+1= |
32×9+2= | 43×9+3= | 54×9+4= |
65×9+5= | 76×9+6= | 87×9+7= | 98×9+8= |
分析:计算出结果,根据结果,总结规律.
解答:解:(1)21×9+1,
=189+1,
=190;
(2)32×9+2,
=288+2,
=290;
(3)43×9+3,
=387+3,
=390;
(4)54×9+4,
=486+4,
=490;
(5)65×9+5,
=585+5,
=590;
(6)76×9+6,
=684+6,
=690;
(7)87×9+7,
=783+7,
=790;
(8)98×9+8,
=882+8,
=890.
规律:加号后面的数是几,得数就是几百九十.
=189+1,
=190;
(2)32×9+2,
=288+2,
=290;
(3)43×9+3,
=387+3,
=390;
(4)54×9+4,
=486+4,
=490;
(5)65×9+5,
=585+5,
=590;
(6)76×9+6,
=684+6,
=690;
(7)87×9+7,
=783+7,
=790;
(8)98×9+8,
=882+8,
=890.
规律:加号后面的数是几,得数就是几百九十.
点评:此题重点考查学生的计算与总结规律的能力.
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