REAL NUMBERS

Which of the following is not an irrational number?

• √2

• π

• 0.25

• √3

The decimal expansion of a rational number is always:

• Terminating or non-terminating repeating

• Non-terminating non-repeating

• Terminating only

• Repeating only

If p and q are coprime, then the HCF of p² and q² is:

• p

• q

• 1

• pq

The product of two irrational numbers is always:

• Irrational

• Rational

• Always natural

• May be rational or irrational

The number 0.101001000100001… is:

• Rational

• Irrational

• Natural

• Whole number

The HCF of 42 and 70 using prime factorisation is:

• 2

• 6

• 14

• 28

Which of these numbers is irrational?

• 1.333…

• 5/7

• √5

• 0.25

The LCM of 8 and 12 is:

• 4

• 24

• 48

• 36

Every composite number can be expressed as:

• A product of primes uniquely, apart from the order of the factors

• A sum of primes

• A difference of primes

• A product of even numbers only