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两位数减一位数(退位)

两位数减一位数(退位). 制作者 : 吉林省梨树县十家堡中心校教师 李权. 一年级数学. 5. 24. 33. 32. 7. 53. 33. 7. 67. 16. 1 .口算 ( 1 ) 12 - 7 =       ( 2 ) 20 + 4 =   ( 3 ) 30 +( 4 - 1 )=   ( 4 ) 35 - 3 = 15 - 8 = 50 + 3 = 40 -( 15 - 8 )=

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两位数减一位数(退位)

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  1. 两位数减一位数(退位) 制作者: 吉林省梨树县十家堡中心校教师 李权 一年级数学

  2. 5 24 33 32 7 53 33 7 67 16 1.口算 (1)12-7=       (2)20+4=   (3)30+(4-1)=   (4)35-3= 15-8= 50+3= 40-(15-8)= 13-6= 7+60= 10+(13-7)=

  3. 做一做这道题 23-7= 16 你们遇到了什么困难?谁给大家谈一谈?

  4. 1 1 1 2 2 2 3 3 3 10 8 9 10 1 2 3 4 5 6 7 1 2 3 4 5 6 7 8 9 10 1 1 1 33 10 1.先摆2捆小棒和3根小棒. 1 2. 3根小棒少于7根,就得把其中的一捆小棒打开,变成10根,打开的10根小棒和原来的3根小棒合起来就是13根单根小棒. 10 加上 等于23根 3. 从13根单根小棒中去掉7根,还剩下6根,和剩下的1捆小棒合起来就是16根小棒,所以,23减7应该得16. 10

  5. 7 7 27 17 37 28 3 51 37 43 72 49 课堂练习 l.口算 12-5= 16-9= 21-4= 32-5= 46-9= 34-6= 2.完成“做一做”第3题并回答 “80-8=”、“56-7=”的算法 : 10-7= 60-9= 42-5= 50-7= 80-8= 56-7=

  6. 布置作业 1.24-6= 40-9= 81-4= 60-3= 54-7= 63-8= 2.被减数是83,减数是6,差是多少? 3.下面的计算对吗?把不对的改正过来. 48-6=32______ 73-8=65______ 44-7=37______

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