advertisement

Challenge 65: ‘Age Old Problems.’ Possible strategies: Mark multiples of different numbers (or square numbers, cube numbers etc.) on a 100 square in different colours. Work systematically from the beginning to spot a pair of numbers which meet the criteria. Alternatively, use lists of times tables and spot pairs of consecutive numbers which meet the criteria. Resources: 100 square. Times tables lists. Simplifications: Set similar problems using easier multiples, e.g. my age this year is a multiple of 2. Next year it will be a multiple of 5. How old am I? Challenges: This year my age is a prime number. Next year my age is a multiple of 4. How old could I be? (11, or 3, or 7, or…) This year my age is a multiple of 19. Last year my age was a multiple of 7. How old am I? (57) Related problems: Challenge 42: ‘Stickers’. Challenge 66: ‘Zids and Zods’. Problem Solving Suffolk Advisory Service