(共22张PPT)
十几减九
9+6=
9+7=
9+3=
15
16
12
9+8=
17
9+4=
13
9+5=
14
9+2=
11
9+(
)=12
3
14
-
9
=
5
摆一摆,算一算。
10-9=1;1+(
)=(
)。
9+(
)=12;
12-9=(
)。
12
-
9
=
3
你喜欢哪种方法?
还可以怎样计算?
3
3
2
3
11-9
12-9
13-9
14-9
15-9
16-9
17-9
18-9
=2
=4
=6
=8
=3
=5
=7
=9
跳木桩
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
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
=
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
亲爱的小朋友,今天这节课你学会了什么新本领?你能告诉大家吗?
小朋友们,再见。