(共21张PPT)
连加连减
口算:
2+4=
6
6+2=
7-4=
6-3=
3-3=
7-2=
6+3=
3-0=
5-4=
3+3=
3
0
3
5
9
3
6
1
8
5
+
2
+
1
=
7
8
3
4
2
3
+
+
=
7
9
5
+
1
+
1
=
7
6
4
+
3
+
(
)
=
(
)
?
1
8
10
+
3
+
5
=
2
8
-
8
2
8
-
2
-
2
6
4
=
8
2
4
4
8
-
4
-
=
2
7
-
1
-
2
=
4
6
10
-
5
-
(
)
=
(
)
3
2
10
-
3
-
3
=
4
先摆一摆,再填数.
?
4
+
3
+
=
10
-
5
-
=
1
8
3
2
(
)
(
)
(
)
(
)
3+4+1=
4+3+2=
2+2+4=
5+0+3=
7+2+1=
6+4+0=
7
8
4
8
7
5
9
10
9
8
10
10
看
谁
算
得
又
对
又
快
10
0
8
2
1
9
10
6
9
7+2+1=
9-6-3=
3+3+2=
10-6-2=
10-4-5=
8+1+0=
4+2+4=
9-0-3=
0+2+7=
10-5-2=
3
总结:
通过对本节课的学习,同学们学会计算连加、连减算式了吗?
作业:
数学书第66页第5题