2
+
1
=
____________________
3
+
1
=
____________________
4
+
1
=
____________________
2
+
2
=
____________________
3
+
2
=
____________________
4
+
2
=
____________________
3
+
4
=
____________________
5
+
5
=
____________________
5
+
3
=
____________________
4
+
5
=
9
