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 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?

List the first five composite numbers.

Prove that 91 is a composite number.