Q 01/05

Which of these numbers is a prime number?

A) 4

B) 6

C) 7

D) 9

Answer · why

C) 7

7 is prime: nothing divides it but 1 and 7, and huge primes keep data safe online, because multiplying two of them is easy while working out which two...

Q 02/05

What do we call a whole number with more than two factors, like 8 or 15?

A) Square

B) Composite

C) Prime

D) Triangular

Answer · why

B) Composite

Composite — every such number is made by multiplying primes together, as 8 is 2 × 2 × 2, which is why primes get called the building blocks of all num...

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

Perimeter is found by adding up the length of every side, which is how you would work out how much fence a garden needs.

Q 04/05

What is the area of a rectangle 6 cm long and 4 cm wide?

A) 10 cm²

B) 24 cm²

C) 48 cm²

D) 96 cm²

Answer · why

B) 24 cm²

24 cm²: picture 4 rows of 6 one-centimetre squares, which is why area is counted in square units.

Q 05/05

What is the distance all the way around a rectangle 5 m long and 3 m wide?

A) 4 m

B) 8 m

C) 16 m

D) 32 m

Answer · why

C) 16 m

16 m: add the length and the width, then double the total, because a rectangle's opposite sides always match.