Number / Number Lines
Counter Square http://www.amblesideprimary.com/ambleweb/mentalmaths/countersquare.html
Number Challenge http://www.edu.dudley.gov.uk/numeracy/Primary/Easter%20CD/programs/number_challenge.swf
Numberline http://www.standards.dfes.gov.uk/primary/teachingresources/mathematics/nns_itps/number_line/num_itp_numberLine1_6.swf
Doubling Halving http://www.shaftesburyprimary.dorset.sch.uk/children/potatos/dub.htm