Play these games:
Can you finish the number sentence?
http://www.primaryresources.co.uk/online/missing.swf
Finish the number pattern
http://www.bbc.co.uk/bitesize/ks2/maths/number/number_patterns/play/
Can you finish the number sentence?
http://www.primaryresources.co.uk/online/missing.swf
Finish the number pattern
http://www.bbc.co.uk/bitesize/ks2/maths/number/number_patterns/play/