(共55张PPT)
你拍1,我拍9,我们都是好朋友,
你拍2,我拍8,团结起来力量大,
你拍3,我拍7,我们从小爱学习,
你拍4,我拍6,说话老实不吹牛,
你拍5,我拍5,两数凑十不马虎。
9+5= 9+3= 9+2=
9+8= 9+7= 9+6=
14
17
12
16
11
15
9+( )=11 9+( )=14
9+( )=17 9+( )=15
9+( )=12 9+( )=18
5
8
6
3
9
2
一个一个地减……
6
15 – 9 =
6
把9分成5和4,
15-9=
10-4=6
15-5=10,
想:9 + ( )= 15
6
15–9 =
6
10-9=1,
6
1+5=6
15 - 9 =
从10里减去9,
3
5
3
3
5
5
11 - 9 = 2
12 - 9 = 3
13 - 9 = 4
14 - 9 = 5
15 - 9 = 6
16 - 9 = 7
17 - 9 = 8
18 - 9 = 9
你发现了什么?
11 - 9 = 2
12 - 9 = 3
13 - 9 = 4
14 - 9 = 5
15 - 9 = 6
16 - 9 = 7
17 - 9 = 8
18 - 9 = 9
。
巧算“十几减9”的方法:就是把被减数个位上的数加1就是“十几减9”的差。
找朋友
5
9
4
2
18-9
14-9
11-9
13-9
比一比(在○里填>、<或=)
15-9○9 12-9○3
5○11-9 7○18-9
9+0○9-0 6○13-9
>
<
=
>
<
=
9+6=
9+7=
9+3=
15
16
12
9+8=
17
9+4=
13
9+5=
14
9+2=
11
9+( )=12
3
11-9=
16-9=
12-9=
2
7
3
15-9=
6
14-9=
5
13-9=
4
18-9=
9
17-9=
8
3
1
5
9
2
10
7
4
8
6
看图列式计算1
-9= (颗)
4
13
13颗
?颗
15朵
6
?朵
15–9 = (朵)
看图列算式2
水果店
我买9个。
还剩多少个?
12-9=3(只)
树上原来有14只小鸟,
飞走了9只小鸟。
树上还有几只小鸟?
原来有15个松果,小松鼠搬走了9 个。
还有几个松果?
14-9=5(只)
15-9=6(个)
11-9
12-9
13-9
14-9
15-9
16-9
17-9
18-9
=2
=4
=6
=8
=3
=5
=7
=9
﹥
﹤
=
16-9
○
6
14-9
○
17-9
﹤
﹤
﹥
给﹥、﹤、或=找个家 。
12-9 ○ 4 11-9 ○ 11+9
13-3 ○ 13-9 18- 9 ○ 9
13-9
8
3
7
5
2
4
6
15-9
14-9
18-9
17-9
12-9
11-9
16-9
13-9
8
3
7
5
2
4
6
15-9
14-9
18-9
17-9
12-9
11-9
16-9
13-9
8
3
7
5
2
4
6
15-9
14-9
18-9
17-9
12-9
11-9
16-9
8
3
7
5
2
4
6
15-9
14-9
18-9
17-9
12-9
11-9
16-9
13-9
8
3
7
5
2
4
6
15-9
14-9
18-9
17-9
12-9
11-9
16-9
13-9
8
3
7
5
2
4
6
15-9
14-9
18-9
17-9
12-9
11-9
16-9
13-9
8
3
7
5
2
4
6
15-9
14-9
18-9
17-9
12-9
11-9
16-9
13-9
8
3
7
5
2
4
6
15-9
14-9
18-9
17-9
12-9
11-9
16-9
13-9
8
3
7
5
2
4
6
15-9
14-9
18-9
17-9
12-9
11-9
16-9
13-9
9
8
3
7
5
2
4
6
15-9
14-9
17-9
12-9
11-9
16-9
13-9
9
18-9
13-9
14-9
15-9
胜利
19-9
17-9
12-9
11-9
18-9
20-9
( )-9=5
16-9
入口
11 - 9 = 2
12 - 9 = 3
13 - 9 = 4
14 - 9 = 5
15 - 9 = 6
16 - 9 = 7
17 - 9 = 8
18 - 9 = 9
11 - 9 = 2
12 - 9 = 3
13 - 9 = 4
14 - 9 = 5
15 - 9 = 6
16 - 9 = 7
17 - 9 = 8
18 - 9 = 9