Prime Numbers Prime Numbers 1a. Choose from the digit cards below to create composite numbers up to 100. 6 2 9 1b. Choose from the digit cards below to create composite numbers up to 100. 7 3 Find all the possibilities. PS 2a. Place the numbers below on the Venn diagram. Prime numbers 53 Multiples of 2 27 7 1 8 Find all the possibilities. D 18 4 2 28 D 2b. Place the numbers below on the Venn diagram. Composite numbers 47 D PS 73 PS 3a. True or false? 62 Multiples of 3 19 69 56 40 39 D PS 3b. True or false? The largest prime number less than thirty is 29. All odd numbers are prime numbers. Jacob Luna Explain your answer. D Explain your answer. R © Classroom Secrets Limited 2018 D classroomsecrets.co.uk Reasoning and Problem Solving – Prime Numbers – Year 5 Developing R Prime Numbers Prime Numbers 4a. Choose from the digit cards below to create composite numbers up to 50 that have a prime factor of 2. 4 6 3 4b. Choose from the digit cards below to create composite numbers up to 50 that have a prime factor of 3. 1 8 Find all the possibilities. 1 2 7 Find all the possibilities. E PS E PS 5a. Place the numbers below on the Venn diagram. 5b. Place the numbers below on the Venn diagram. Prime factors of 20 Prime factors of 66 20 2 Prime factors of 30 15 5 3 30 10 E 33 PS 6a. True or false? 22 2 31 3 PS 6b. True or false? 2 is the only even prime number. Alfie Grace Explain your answer. © Classroom Secrets Limited 2018 11 E Every odd composite number has 3 as a prime factor. E 7 Prime factors of 63 Explain your answer. R E classroomsecrets.co.uk Reasoning and Problem Solving – Prime Numbers – Year 5 Expected R Prime Numbers Prime Numbers 7a. Choose from the digit cards below to create composite numbers up to 50 that have a 2-digit prime factor. 6 1 3 7b. Choose from the digit cards below to create composite numbers up to 50 that have only two prime factors. 4 5 Find all the possibilities. 2 3 1 Find all the possibilities. GD PS GD PS 8a. Place the numbers below on the Venn diagram. 8b. Place the numbers below on the Venn diagram. Sum of prime factors > 15 Sum of prime factors < 20 39 26 Has 2 as a prime factor 46 33 38 49 34 GD 26 PS 9a. True or false? 15 Has 5 as a prime factor 38 35 85 55 14 GD PS 9b. True or false? All 2-digit composite numbers have a prime factor of 2. The sum of the prime factors of any composite number is always odd. Judy Theo Explain your answer. GD Explain your answer. R © Classroom Secrets Limited 2018 GD classroomsecrets.co.uk Reasoning and Problem Solving – Prime Numbers – Year 5 Greater Depth R