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 12
Describe the Sieve of Eratosthenes method for finding prime numbers.
Explain the difference between a prime number and a composite number.
Explain why 1 is neither prime nor composite.
Find all prime numbers between 30 and 50.
Given the number 143, determine whether it is prime or composite and justify your answer.
Given the number 143, determine whether it is prime or composite and justify your answer.
If a number n > 1 is not divisible by any prime less than or equal to √n, what can you conclude about n?
Prove or disprove: The difference between any two consecutive prime numbers is always even.
Which of the following is NOT a composite number?
(1) 15
(2) 21
(3) 23
(4) 27
Which of the following numbers is a composite number?
(1) 113
(2) 119
(3) 127
(4) 131
Which of the following numbers is a composite number?
(1) 53
(2) 59
(3) 61
(4) 65
Which of the following numbers is a prime number?
(1) 87
(2) 89
(3) 91
(4) 93
Fill in the blank: A composite number has at least _______ positive divisors.
Fill in the blank: The number 2 is the only _______ prime number.
Fill in the blank: The number 49 is a _______ number.
Fill in the blank: The number 97 is a _______ number.
If n is a composite number, must it have a prime factor less than or equal to √n?
Is 1 considered a prime number?
Is 221 a prime number?
Is every natural number greater than 1 either a prime or a composite number?
