Q 01/05

Which of these numbers is a prime number?

A) 4

B) 6

C) 7

D) 9

Answer · why

C) 7

Its only factors are 1 and itself; 4, 6 and 9 can each be made by multiplying two smaller numbers.

Q 02/05

A number bigger than 1 that is NOT prime is called what?

A) Negative

B) Composite

C) Fractional

D) Irregular

Answer · why

B) Composite

Composite numbers such as 8, 9 and 12 can be split into two smaller whole-number factors.

Q 03/05

What do we call the distance all the way around the outside of a shape?

A) Diameter

B) Altitude

C) Perimeter

D) Volume

Answer · why

C) Perimeter

You find it by adding up the lengths of every side.

Q 04/05

A rectangle is 6 cm long and 4 cm wide. What is its area?

A) 10 cm²

B) 20 cm²

C) 24 cm²

D) 30 cm²

Answer · why

C) 24 cm²

Area of a rectangle is length times width, so 6 × 4 = 24.

Q 05/05

A rectangle is 5 m long and 3 m wide. How far is it all the way around the outside?

A) 8 m

B) 15 m

C) 16 m

D) 30 m

Answer · why

C) 16 m

Add two lengths and two widths: 5 + 5 + 3 + 3 = 16.