Addition Facts: The Nines
9
+
0
=
9
9
+
1
=
10
9
+
2
=
11
9
+
3
=
12
9
+
4
=
13
9
+
5
=
14
9
+
6
=
15
9
+
7
=
16
9
+
8
=
17
9
+
9
=
18
9
+
10
=
19
9
+
11
=
20
9
+
12
=
21
Arithmetic Fact Pages, compliments of S&S Software. (http://www.sssoftware.com).
© 1999 by S&S Software.