内容正文:
10以内数的加与减
做个减法表
复习导入
4-2= 5-5= 4+5=
9-9= 8-3= 9-8=
9-5= 8-4= 9-2=
8-4= 6-5= 10-4=
算一算,填一填。
9
0
2
0
5
1
4
4
7
4
1
6
2
探究新知
这几个算式都是6减几。
这几个算式得数都是8。
3
探究新知
将6减几的算式排一排。
6 - 0 =
6 - 1 =
6 - 2 =
6 - 3 =
6 - 4 =
6 - 5 =
6 - 6 =
4
探究新知
得数是8的减法算式,排一排。
10 - 2 =
9 - 1 =
8 - 0 =
5
下面是淘气做的加法表,请你帮他填完整。
0 1 2 3 4 5 6 7 8 9 10
10-10 10-9 10-6 10-1 10-10
9-7 9-3 9-1
8-5 8-2
7-4 7-1
6-6 6-4 6-3 6-0
5-4 5-1
4-2 4-0
3-1 3-0
2-2 2-1
1-0
9-8
8-7
7-6
6-5
4-3
3-2
10-8
8-6
7-5
2-0
10-7
9-6
10-5
9-4
8-3
7-2
6-1
5-0
10-4
10-3
9-2
8-1
7-0
10-2
9-1
8-0
9-9
8-8
7-7
5-5
4-4
3-3
1-1
0-0
5-3
5-2
4-1
9-5
8-4
7-3
6-2
6
0 1 2 3 4 5 6 7 8 9 10
10-10 10-9 10-8 10-7 10-6 10-5 10-4 10-3 10-2 10-1 10-0
9-9 9-8 9-7 9-6 9-5 9-4 9-3 9-2 9-1 9-0
8-8 8-7 8-6 8-5 8-4 8-3 8-2 8-1 8-0
7-7 7-6 7-5 7-4 7-3 7-2 7-1 7-0
6-6 6-5 6-4 6-3 6-2 6-1 6-0
5-5 5-4 5-3 5-2 5-1 5-0
4-4 4-3 4-2 4-1 4-0
3-3 3-2 3-1 3-0
2-2 2-1 2-0
1-1 1-0
0-0
从上到下,减号左面的数依次减1,
减号右面的数依次减1,得数不变。
7
0 1 2 3 4 5 6 7 8 9 10
10-10 10-9 10-8 10-7 10-6 10-5 10-4 10-3 10-2 10-1 10-0
9-9 9-8 9-7 9-6 9-5 9-4 9-3 9-2 9-1 9-0
8-8 8-7 8-6 8-5 8-4 8-3 8-2 8-1 8-0
7-7 7-6 7-5 7-4 7-3 7-2 7-1 7-0
6-6 6-5 6-4 6-3 6-2 6-1 6-0
5-5 5-4 5-3 5-2 5-1 5-0
4-4 4-3 4-2 4-1 4-0
3-3 3-2 3-1 3-0
2-2 2-1 2-0
1-1 1-0
0-0
从左到右,减号左面的数依次不变,减号右面的数减1,得数依次加1。
8
0 1 2 3 4 5 6 7 8 9 10
10-10 10-9 10-8 10-7 10-6 10-5 10-4 10-3 10-2 10-1 10-0
9-9 9-8 9-7 9-6 9-5 9-4 9-3 9-2 9-1 9-0
8-8 8-7 8-6 8-5 8-4 8-3 8-2 8-1 8-0
7-7 7-6 7-5 7-4 7-3 7-2 7-1 7-0
6-6 6-5 6-4 6-3 6-2 6-1 6-0
5-5 5-4 5-3 5-2 5-1 5-0
4-4 4-3 4-2 4-1 4-0
3-3 3-2 3-1 3-0
2-2 2-1 2-0
1-1 1-0
0-0
从左下到右上,减号左面的数加1,减号右面的数依次不变,得数依次加1。
9
0 1 2 3 4 5 6 7 8 9 10
10-10 10-9 10-8 10-7 10-6 10-5 10-4 10-3 10-2 10-1 10-0
9-9 9-8 9-7 9-6 9-5 9-4 9-3 9-2 9-1 9-0
8-7 8-6 8-5 8-4 8-2 8-1 8-0
7-7 7-6 7-5 7-4 7-3 7-2 7-1 7-0
6-6 6-5 6-3 6-2 6-1 6-0
5-5 5-4 5-3 5-1 5-0
4-4 4-3 4-2 4-1 4-0
3-3 3-1 3-0
2-2 2-1 2-0
1-1 1-0
0-0
8-8
3-2
6-4
5-2
8-3
根据刚才找到的规律,填一填。
10
巩固练习
1.找规律,补全下面的表格。
2 - 0
3 - 1
4 - 1
5 - 2
4 - 3
5 - 4
11
巩固练习
2.在括号里填上合适的数。
2+( )=7 ( )-3=2
4+( )=8 10-7=( )
( )-5=4 6+( )=8
9-( )=3 7-4=( )
5
4
9
6
5
3
2
3
课堂小结
通过今天的学习,你有哪些收获?
感谢观看
14
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