As you can imagine, multiplication is a massive part of numeracy in Primary 4.   Here are some handy websites:

https://www.topmarks.co.uk/maths-games/5-7-years/times-tables

https://www.topmarks.co.uk/maths-games/5-7-years/multiplication-and-division

http://www.teachingtables.co.uk/tm/tmgame/tgame2.html (my personal favourite!)

And a wee bonus for those worksheet lovers out there: Sheet 15