The 9 trick we know is that whatever you are multiplying 9 by, the answer starts with one less that number and then the two numbers add up to 9.

Example 9 x 2 would be 1 (1 is 1 less than 2) and then 8 as 1 + 8 = 9. So the answer would be 18.

9 x 3 would be 27 as (2 is 1 less than 3) and (2 + 7 = 9).

Make sense? It's hard to explain in writing!!! :-)