It's difficult to answer this precisely as there is so little information to go on. My first port of call for ideas would be the TES resources: http://www.tes.co.uk/ks2-maths-primary-teaching-resources/ Or try this site: http://www.leics.gov.uk/index/education/information_about_schools/support_for_schools/sips/ais-numeracy/lgfl_numeracy/teachers_primary/teaching_ideas/mental_oral_starters.htm The Sage