Prime Numbers Unit Review

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Prime concepts review game

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Prime Numbers Unit Review


Prime Numbers Unit ReviewVersión en línea Prime concepts review game por Kethia Teng 1 What is a prime number? a A number that can be divided evenly by all numbers b A number greater than 1 with exactly two distinct divisors (1 and itself) c A number with exactly one divisor d Any even number 2 Which is a prime number? a 21 b 9 c 13 d 15 3 Is 1 a prime number? a Sometimes b Yes c Only when it is even d No 4 What are the prime factors of 12? a 3 and 6 b 2 and 4 c 4 and 6 d 2 and 3 5 What is the prime factorization of 18? a 2 × 3 b 3 × 6 c 2 × 9 d 2 × 3 × 3 6 Is 0 a prime number? a No b Sometimes c Only with special rules d Yes 7 Is 29 a prime number? a No b Yes c Only if it is even d Sometimes 8 Which is a factor of 28? a 13 b 5 c 9 d 7 9 Prime factorization of 28 using a factor tree yields which set? a 4 × 7 b 7 × 7 × 2 c 2 × 2 × 7 d 2 × 14 10 Which of the following is prime between 20 and 30? a 27 b 25 c 23 d 21 11 Which of these numbers has exactly two factors? a A) 16 b B) 18 c C) 19 d D) 20 12 What is the prime factorisation of 48? a A) 2 × 24 b B) 2 × 2 × 2 × 2 × 3 c C) 4 × 12 d D) 6 × 8 13 Which number is prime? a A) 37 b B) 39 c C) 45 d D) 51 14 Which is the correct prime factorisation of 60? a A) 2 × 3 × 10 b B) 2² × 3 × 5 c C) 2 × 30 d D) 3 × 20 Feedback 1 A prime number has exactly two distinct divisors: 1 and itself. 2 13 has no divisors other than 1 and 13; the others have more factors. 3 By definition, primes have exactly two distinct divisors; 1 has only one divisor. 4 Prime factors are the prime numbers that multiply to give the number: 12 = 2 × 2 × 3. 5 18 = 2 × 3 × 3, using prime factors only. 6 Prime numbers are positive integers greater than 1. 7 29 has no divisors other than 1 and 29. 8 Factors of 28 include 1, 2, 4, 7, 14, 28; among options, 7 is a factor. 9 28 = 2 × 2 × 7; prime factors are 2 and 7. 10 23 is prime; 21, 25, and 27 are composite.

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Prime Numbers Unit Review

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Prime Numbers Unit ReviewVersión en línea

por Kethia Teng

What is a prime number?

Which is a prime number?

Is 1 a prime number?

What are the prime factors of 12?

What is the prime factorization of 18?

Is 0 a prime number?

Is 29 a prime number?

Which is a factor of 28?

Prime factorization of 28 using a factor tree yields which set?

Which of the following is prime between 20 and 30?

Which of these numbers has exactly two factors?

What is the prime factorisation of 48?

Which number is prime?

Which is the correct prime factorisation of 60?

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