Table of Nine

Write 0 to 9 in one column.....next to it write 9 to 0 

0  9

1  8

2  7

3  6

4  5

5  4

6  3

7  2

8  1

9  0

....and you have the table of 9 ! Also notice that  the sum of the two numbers in each row is 9 too ..... 

RSK