Grade 9 Mathematics Quiz on Number Systems

What is the set of natural numbers denoted by?

• ℕ

• ℝ

• ℚ

• ℤ

Which of the following is a prime number?

• 4

• 6

• 8

• 7

What is the GCF of 30 and 45?

• 15

• 20

• 5

• 10

Which of the following numbers is composite?

• 5

• 9

• 3

• 2

What is the least common multiple (LCM) of 10 and 15?

• 45

• 60

• 15

• 30

Which of the following is a characteristic of prime numbers?

• They are always even.

• They can be negative.

• They are only divisible by 1 and themselves.

• They have more than two factors.

What is the prime factorization of 48?

• 2 × 2 × 2 × 2 × 3

• 2 × 3 × 4

• 3 × 3 × 2 × 2

• 2 × 2 × 2 × 3

Which of the following is a rational number?

• √2

• 1/2

• π

• e

What is the set of integers denoted by?

• ℝ

• ℚ

• ℤ

• ℕ

Which of the following is NOT a factor of 60?

• 1

• 2

• 3

• 7