Math Trainer - this is a fantastic site which actually gives you practice in the number facts which you find difficult to learn. Start with the 1x1 to 5 x 5 activity and go on from there.
Traffic Lights - which times table makes the different lights go on? Test your knowledge of times tables with this great game from BEAM.
Hit the button - Times tables, division facts, addition facts
Bingo - times and divide
Multiplication - grid method
Addition balance - addition bonds