Prime and Composite Numbers

Math ⇒ Number and Operations

Prime and Composite Numbers starts at 6 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Prime and Composite Numbers. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.

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.

If a number has exactly three positive divisors, is it prime, composite, or neither?

If a number n > 1 is not divisible by any prime less than or equal to √n, what can you conclude about n?

List the first five odd prime numbers.

Prove or disprove: The difference between any two consecutive prime numbers is always even.

Prove that there are infinitely many prime numbers.

Which of the following numbers is both a prime and a twin prime? (1) 11 (2) 13 (3) 17 (4) 19