(共15张PPT)
加减混合②
9-5-1= 6+2-3= 8-1+0=
4+1+5= 6-0-6= 3+2+4=
练一练
3
5
7
10
0
9
按“从左往右”的顺序计算
原来有5只气球,
飞走了2只,
又飞走了3只
现在还剩下
几只气球?
3
5-2-3= 0
5
2
3
0
连减
-
-
编一编,算一算
1.
2.
3.
4-2+3= 5
4
2
2
3
5
1.
加减混合
4+2+1= 7
7
4
2
1
2.
连加
7+2
-2
3.
7+2-2= 7
编一编,算一算
+
+
2
3
5
=
10
-
+
8
2
5
=
5
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
+
1
3
4
+
+
1
3
4
+
=
8
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
+
1
3
4
+
=
8
+
1
3
4
+
=
8
0
1
2
3
4
5
6
7
8
9
+
7
2
3
-
+
7
2
3
-
=
6
0
1
2
3
4
5
6
7
8
9
+
1
3
4
+
=
8
+
1
3
4
+
=
8
0
1
2
3
4
5
6
7
8
9
+
7
2
3
-
+
7
2
3
-
=
6
0
1
2
3
4
5
6
7
8
9
-
9
4
2
-
-
9
4
2
-
=
3
=6
1
2
3
+
+
3
=6
5
4
3
+
-
0
1
2
3
4
5
6
7
8
9
=6
10
3
1
-
-
7