Number Toolkit (Cambridge (CIE) IGCSE Maths: Extended)

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From the list, write down a number that is

i) a multiple of 3,

[1]

ii) a cube number,

[1]

iii) a prime number,

[1]

iv) an irrational number.

[1]

Write down a prime number between 50 and 60.

Write down a prime number between 20 and 30.

1, 2, 3, 5 and 7 are all common factors of two numbers.
Write down the digit that the two numbers must end in.

Insert one pair of brackets to make this calculation correct.

Explain why is irrational.