Prime & Composite Basics

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Prime vs composite quiz

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Milagros Valdivia

Philippines

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Prime & Composite Basics


Prime & Composite BasicsVersion en ligne Prime vs composite quiz par Milagros Valdivia 1 What is a prime number? a A number with more than two divisors b A natural number >1 with exactly two divisors: 1 and itself. c The number 1 is prime d Any even number >2 2 Which number is prime? a 21 b 25 c 29 d 15 3 Is 1 a prime number? a Yes b Only in some definitions c No d Only for prime powers 4 Which number is composite? a 13 b 15 c 11 d 7 5 True or False: All odd numbers greater than 2 are prime. a True b Depends on the definition c Only sometimes d False 6 Is 2 a prime number? a No b Only for odd numbers c Only divisible by 0 d Yes 7 Is 4 a prime number? a Only prime if square root is integer b No c Only in base-2 d Yes 8 Which statement about primes is true? a Even numbers are always prime b All numbers with one divisor are prime c Every number is divisible by 1 d Primes have exactly two divisors 9 Which of the following numbers is prime? a 9 b 19 c 12 d 18 10 How can you tell a prime number from a composite number? a Check if it ends with 0 or 5 b Check if it is odd c Check if it is even d Check if it has more than two divisors Feedback 1 Prime numbers have exactly two distinct divisors. Even numbers can be composite; 1 has only one divisor. 2 Prime numbers have no divisors other than 1 and themselves; 15, 21, 25 are composite. 3 By definition, primes are >1, so 1 is not prime. 4 Composite numbers have more than two divisors; 15 = 3×5. 5 Many odd numbers like 9, 15 are composite. 6 2 is the smallest and only even prime number. 7 4 has divisors 1,2,4, so it is composite. 8 Only primes have exactly two distinct divisors; 1 has one divisor. 9 19 is prime; 9, 12, and 18 are composite. 10 If a number has more than two divisors, it is composite; primes have exactly two.

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Prime & Composite Basics

Test

À propos de cette activité

Créé par

Téléchargez la version pour jouer sur papier

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Prime & Composite BasicsVersion en ligne

par Milagros Valdivia

What is a prime number?

Which number is prime?

Is 1 a prime number?

Which number is composite?

True or False: All odd numbers greater than 2 are prime.

Is 2 a prime number?

Is 4 a prime number?

Which statement about primes is true?

Which of the following numbers is prime?

How can you tell a prime number from a composite number?

Feedback