The reason I ask this question "What multiplication fact can be found by using the arrays for 2x9 and 5x9 ?" because I want to understand what exactly it mean, Then I could help my son to do the homework.

Question

This is not my son post it to ask you.
Thanks.

Answer 1

This site should help you.

http://www.haelmedia.com/OnlineActivities_txh/mc_txh3_002.html