1.5 Addition/ Doubles plus One (neighbors)
7
5
8
6
9
7
4
5
8
6
+8
+4
+9
+7
+8
+6
+5
+6
+7
+5
3
5
8
7
4
6
4
5
9
6
+4
+6
+7
+6
+5
+5
+3
+4
+8
+7
4
5
6
8
5
7
6
4
8
7
+3
+4
+7
+7
+6
+8
+5
+5
+9
+6
3
8
6
4
6
9
7
7
5
8
+4
+7
+5
+3
+7
+8
+8
+6
+6
+9
1.5
Addition