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《 口算两位数加两位数的进位加法 》

微课件. 新人教版小学数学三年级上册第 9 、 10 页第 2 单元第 1 课时. 《 口算两位数加两位数的进位加法 》. 佛山市南海区丹灶镇金沙小学. 制作人:陈彩桂. 先算:( )+( ) = ( ). 再算:( )+( ) = ( ). 引导发现 自主探究. ( 2 ) 二年级一共要买多少张车票?. 二(1) 39人. 二(2) 44人. 83. (张). 39+ 44 =. 你会口算吗?. 39+44=. 83. 39+44=. 83. 39+44=. 83. 40. 4. 30. 9.

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《 口算两位数加两位数的进位加法 》

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  1. 微课件 新人教版小学数学三年级上册第9、10页第2单元第1课时 《口算两位数加两位数的进位加法》 佛山市南海区丹灶镇金沙小学 制作人:陈彩桂

  2. 先算:( )+( )=( ) 再算:( )+( )=( ) 引导发现 自主探究 (2)二年级一共要买多少张车票? 二(1) 39人 二(2) 44人 83 (张) 39+44= 你会口算吗? 39+44= 83 39+44= 83 39+44= 83 40 4 30 9 40 4 30 9 79 70 13 74 先算:30+44=74, 先算:30+40=70, 40 39 79 再算:74+9=83, 再算: 9+4=13, 4 83 79 再算:70+13=83 答:二年级一共要买83张车票。 还可以怎样算?

  3. 先算:( )+( )=( ) 再算:( )+( )=( ) 引导发现 自主探究 凑十法 还可以这样算: 算多了1要减1。 39 39+44= 83 39+44 1 43 -1 = +44 40 40 = 84-1 = 83 1 39 40 43 83 40 小结: 口算的方法是多种多样的,你觉得哪种适合你,就选用那种方法吧。

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