Learning multiplication facts is an ongoing process in Grade 4. Here are some things that could help:
The remaining times tables are:
3X6 3X7 3X8 4X6 4X7 4X8 6X6 6X7 6X8 7X7 7X8 8X8
Practice Online:
Multiplication.com - Teach the Multiplication Facts - Times Tables
Batter's Up Baseball Math Game (Multiplication)
Target Exactly What You Need with the No Frills Speed and Accuracy Drills:
Make Flashcards Using this Resource: