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Worksheet: Understanding the Difference between Prime and Composite Numbers

Q1:

What is a prime number?

  • Aa number with exactly three factors, one factor is repeated and the other two are 1 and itself
  • Ba number with exactly two factors, 0 and itself
  • Ca number with exactly two factors, 1 and itself
  • Da number that has one factor repeated
  • Ea number with more than two factors

Q2:

What is a composite number?

  • Aa number with exactly two factors, 0 and 1
  • Ba number with exactly two factors, 0 and itself
  • Ca number with more than two factors
  • Da number that has one factor repeated
  • Ea number with exactly two factors, 1 and itself

Q3:

Is 21 a prime or a composite number?

  • Aa composite number
  • Ba prime number

Q4:

Is 23 a prime or a composite number?

  • Aa prime number
  • Ba composite number

Q5:

All prime numbers are odd except .

Q6:

Determine whether the number 226 is prime, composite, or neither.

  • Acomposite
  • Bneither prime nor composite
  • Cprime

Q7:

Caribou calves weigh about 13 pounds at birth. Is the number 13 a prime or a composite number?

  • Aprime
  • Bcomposite

Q8:

A teacher asked her class to color all the prime numbers between 1 and 10. Here are some of their answers. Which one is correct?

  • A
  • B
  • C
  • D
  • E

Q9:

A wildlife biologist once observed a caribou traveling at 44 miles per hour. Determine whether the given speed is a prime or composite number.

  • Acomposite
  • Bprime

Q10:

Michael is learning about prime numbers. He knows that 5 is a prime number, because the only factors of 5 are 1 and 5.

Is 9 a prime number? Why?

  • ANo, because 3 is a factor.
  • BYes, because its only factors are 1 and 9.

Q11:

Wayne says that 1 is a prime number because it only has 1 factor pair.

Is he correct? Why?

  • ANo, prime numbers have more than two factors, 1 only has one factor.
  • BYes, because all odd numbers are prime.
  • CNo, prime numbers have two factors, 1 only has one factor.
  • DNo, because all odd numbers are prime.
  • EYes, 1 only has one factor.

Q12:

Madison says that every even number is composite because 2 is a factor.

Is she correct? Why?

  • ANo, because 2 is even and composite.
  • BYes, because 2 is even and composite.
  • CNo, because 2 is even and prime.
  • DYes, because all odd numbers are prime.
  • EYes, because 2 is an even number.

Q13:

What is the greatest prime number between 15 and 24?

Q14:

Isabella bought these four raffle tickets, and one of them was the winning ticket.

The winning number is a prime number between 10 and 20. Which of her tickets won the prize?

  • Aticket number 18
  • Bticket number 23
  • Cticket number 17
  • Dticket number 34
  • Eticket number 15

Q15:

The table shows all the factors of some numbers.

Number 101133157145
Factor of 1, 1011, 7, 19, 1331, 1571, 5, 29, 145

Which of the numbers are prime?

  • A133 and 157
  • B157 and 145
  • C101 and 157
  • D101 and 133
  • E133 and 145

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