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Name:__________________ Year 7 Number Theory Topic Test ANSWER ANSWER 1.List the first 5 counting numbers. 16. Find 2. List the first 3 odd numbers. 17. Find 3. Write the even numbers between 11 and 19. 18. ( 25 ) 2 = ? 4. List all the factors of 24. 19. Evaluate 2 3 + 7 2 5. Write the prime numbers less than 30. 20. What is the square of 100? 6. Why is 4 a prime number? 21. What is the cube root of 8? 7. . Give 2 prime numbers that add to give 20. 22. What is the sixth squared number? 8. Write 42 as a product of its prime factors. 23. Write the tenth cubic number. 9. . What is the 5th composite number? 24. All even numbers are divisible by.........? 10. What is the first multiple of 9? 25. Is 4977 divisible by 3? 11. Write the first 3 multiples of 12. 26. Is 828 426 690 divisible by 10? 12. What is the lowest common multiple of 9 and 12? 27. Is 322251 divisible by 5? 13. List the factors of 24. 28. How do you know if a number is divisible by 5? 14. List the factors of 18. 29. Write a 3 digit number that is divisible by 4. 30. 13771285 is divisible by which of the following numbers? 2, 3, 5, 9. 15. The highest common factor of 18 and 24 is ... ? 81 3 64 ANSWER 31. Draw a factor tree to show 96 as a product of its prime factors. 32. List all the factors of 100. 33. 1000 2 = ..................... 34. What is the lowest common multiple of 6, 4 and 9? 35. Halve the square of 8. 36. Circle the numbers that are divisible by 6: 5225, 3552, 7290, 3225, 6243, 1715 37. Write 3 consecutive odd numbers that add to 123. 38. If 59 2 = 3481, then 3481 = ....? 39. How many multiples of 7 are less than 100? 40. Who am I? I am a three digit whole number. My first digit is a perfect square. My other two digits are a perfect cube. The sum of my digits is 13.