(共13张PPT)
和是9的加法和9减几
1+7=
8-6=
3+5=
8-1=
7+1=
2+6=
8-4=
8-7=
5+3=
8-2=
8-5=
4+4=
8-8=
0+8=
8-0=
8+0=
8
8
8
8
8
8
8
8
8
2
0
7
6
1
3
4
一共有几人?
9人
8 1 9
1 8 9
一共9人,看跳高的8人,跳高的几人?
9 8 1
一共9人,看跳高的8人,跳高的几人?
9 1 8
一共9人,跳高的1人,看跳高的几人?
9 8 1
9
9
8
1
1 + 8 = 9 9 - 1 = 8
8 + 1 = 9 9 - 8 = 1
2 + 7 = 9 9 - 2 = 7
7 + 2 = 9 9 - 7 = 2
3 + 6 = 9 9 - 3 = 6
6 + 3 = 9 9 - 6 = 3
4 + 5 = 9 9 - 4 = 5
5 + 4 = 9 9 - 5 = 4
0 9
1 8
2 7
3 6
4 5
5 4
6 3
7 2
8 1
9 10
9–0 = 9
9–2 = 7
9–1 = 8
9–3 = 6
9–5 = 4
9–6 = 3
9–4 = 5
9–7 = 2
9–8 = 1
9–9 = 0
1
8
1
8
=
5
+
2
7
=
8
-
4
4
你收获了什么
9
9
7
9
9
5
9
2
3
1
9
4