Prime Numbers Quiz
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Questions and Answers

Which of the following is a prime number?

  • 15
  • 18
  • 11 (correct)
  • 12
  • What is the first prime number?

  • 3
  • 4
  • 5
  • 2 (correct)
  • Which of the following numbers is composite?

  • 21 (correct)
  • 29
  • 31
  • 23
  • What are the factors of 24?

    <p>$1, 24, 2, 12, 3, 8, 4, 6$</p> Signup and view all the answers

    What is a factor tree used for?

    <p>Illustrating how a number can be divided down into its factors</p> Signup and view all the answers

    What method did Eratosthenes devise to predict where primes might be?

    <p>Using the Sieve of Eratosthenes to eliminate multiples of smaller numbers</p> Signup and view all the answers

    What did Fibonacci publish in Liber Abaci in 1202?

    <p>The first algorithm for testing primality in numbers</p> Signup and view all the answers

    What is Fermat's Little Theorem used for?

    <p>Testing a number for primality</p> Signup and view all the answers

    What is the main purpose of primality tests?

    <p>To determine whether or not a number is prime or composite</p> Signup and view all the answers

    What are some quick criteria that can be used to rule out composite numbers?

    <p>$2$ is the only even prime, $5$ ends in $5$ or $0$, and sum of digits divisible by $3$</p> Signup and view all the answers

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