PRIME NUMBERS (YEAR 5)

Which of the following is the first prime number?

• 1

• 2

• 4

• 6

Which of the following numbers is a prime number?

• 9

• 12

• 17

• 18

What is the main characteristic of a prime number?

• It can only be divided by 1 and itself

• It is always an even number

• It is always an odd number

• It can be divided by any number

Which of the following is not a prime number?

• 5

• 7

• 9

• 11

Which of the following is the largest prime number?

• 19

• 23

• 27

• 29

Why is 4 not a prime number?

• It is an even number
  

• It has more than two factors

• It is an odd number

• It is greater than 2

Which of the following numbers are prime numbers between 20 and 40?

• 21, 25, 27

• 23, 29, 31, 37

• 22, 26, 30, 36

• 24, 28, 32, 38

Which of the following is not a factor of 6?

• 1

• 2

• 3

• 5

What is the sum of all prime numbers from 10 to 20?

• 50

• 60

• 65

• 70

What is the best method to determine whether a number is prime?

• Divide the number by 2 and check if it is an exact division

• Check if it can only be divided by 1 and itself

• Check if it is an odd number

• Add 2 to the number