You can practice a lot. You should eventually get it just by practice.
You can do a reward thing where you get something like one M&M for each row you get right in your head.
Once you get used to the rows you can write the times tables out on a paper and have someone quiz you by randomly selecting boxes and crossing each box out when you get that box right. You get some kind of candy or treat or whatever when you complete rows or the entire table.