5、4、3、2加几
人教新课标版一年级数学上册
9 + 5＝
9 + 3＝
8 + 5＝
8 + 3＝
9 + 4＝
9 + 2＝
8 + 4＝
7 + 5＝
5 + 7＝
5 + 8＝
怎样想能很快地说出得数？
4 + 8＝
3 + 9＝
怎样想能很快地说出得数？
1．
=
=
2．
7 + 5＝
5 + 7＝
9 + 5＝
5 + 9＝
3．
9 + 4＝
4 + 9＝
8 + 3＝
3 + 8＝
9 + 2＝
2 + 9＝
9 + 5 =
8 + 5 =
9 + 4 =
8 + 4 =
9 + 3 =
8 + 3 =
14
13
13
12
12
11
9 + 2 =
7 + 5 =
11
12
1
5 + 6 = □
5 + 8 = □
因为 6 + 5 = 11
所以 5 + 6 = 11
因为 8 + 5 = 13
所以 5 + 8 = 13
11
13
2
4 + 7 = □
3 + 9 = □
因为 7 + 4 = 11
所以 4 + 7 = 11
因为 9 + 3 = 12
所以 3 + 9 = 12
11
12
1.
=
=
2.
7 + 5 =
9 + 5 =
8 + 4 =
5 + 7 =
5 + 9 =
4 + 8 =
3.
9 + 4 =
8 + 3 =
9 + 2 =
4 + 9 =
3 + 8 =
2 + 9 =
5
+
8
13
3
+
9
12
12
14
12
12
14
12
13
13
11
11
11
11
做一做
谢谢观看