Addition Facts: The Threes
3
+
0
=
3
3
+
1
=
4
3
+
2
=
5
3
+
3
=
6
3
+
4
=
7
3
+
5
=
8
3
+
6
=
9
3
+
7
=
10
3
+
8
=
11
3
+
9
=
12
3
+
10
=
13
3
+
11
=
14
3
+
12
=
15
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© 1999 by S&S Software.