Prime and Composite Numbers
Math ⇒ Number and Operations
Prime and Composite Numbers starts at 6 and continues till grade 12.
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See sample questions for grade 11
Describe the Sieve of Eratosthenes and its use in finding prime numbers.
Explain the difference between a prime number and a composite number.
Explain why 51 is not a prime number.
Find all prime numbers between 30 and 50.
Find the largest prime number less than 100.
Find the sum of all prime numbers less than 20.
Given the number 143, determine whether it is prime or composite and justify your answer.
If a number has exactly two distinct positive divisors, what type of number is it?
Which of the following is a property of all composite numbers?
(1) They have exactly two positive divisors
(2) They are always odd
(3) They have more than two positive divisors
(4) They are always even
Which of the following is NOT a composite number?
(1) 15
(2) 27
(3) 31
(4) 49
Which of the following numbers has exactly three distinct positive divisors?
(1) 4
(2) 9
(3) 8
(4) 27
Which of the following numbers is a composite number?
(1) 17
(2) 23
(3) 35
(4) 53
Fill in the blank: A composite number has at least _______ positive divisors.
Fill in the blank: The number 1 is _______ prime nor composite.
Fill in the blank: The only even prime number is _______.
Fill in the blank: The prime factorization of 60 is 2 × 2 × 3 × _______.
A student claims that all odd numbers are prime. Is this statement correct?
If a number is divisible by 2 and 3, can it be a prime number?
If n is a prime number greater than 2, is n always odd?
Is 2 a composite number?
