1.6 Addition/ Doubles plus Two (near neighbors)
7
4
7
8
5
3
9
6
6
5
+5
+6
+9
+6
+7
+5
+7
+8
+4
+3
7
6
9
4
8
5
6
8
9
7
+5
+8
+7
+6
+6
+7
+4
+6
+7
+9
5
6
3
7
4
5
6
7
8
5
+7
+4
+5
+5
+6
+3
+8
+9
+6
+3
5
6
6
7
4
3
6
7
6
8
+7
+4
+8
+5
+6
+5
+8
+9
+4
+6
1.6
Addition