Number Properties - Assessment

What makes a number prime?

Which of the numbers below are prime?

• 1

• 2

• 3

• 4

• 5

Which of the numbers below are prime?

• 11

• 12

• 13

• 14

• 15

Which of the numbers below are prime?

• 31

• 33

• 35

• 37

• 39

What makes a number composite?

Is 21 prime or composite?

• prime, because is has 2 factors

• composite, because it has 2 factors

• composite, because it has 4 factors

• neither

Is 36 prime or composite?

• prime, because it only has 2 factors

• composite because it has 9 factors

• composite, because it has 8 factors

• composite, because it has 10 factors

What is the formula to find a square number?

What is the 7th square number?

What is the 9th square number?