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A prime number has only two factors: 1 and itself. Write the factors of each number. Tick if they are prime...

1. A prime number has only two factors: 1 and itself. Write the factors of each number. Tick if they are prime numbers.
Number | Factors | Prime number?
35
44
23
150
2. Choose the correct answer to complete the statement.
A number that is not a prime number is called a ______ number.
multiple composite counting
3. a. Colour all the prime numbers.
b. Choose any six numbers that are not coloured in. Write all the factors of each number.
c. Underline the prime factors in each set of factors in question 3b.

Answer

  1. 35: Factors are 1, 5, 7, 35. Not a prime number.
    44: Factors are 1, 2, 4, 11, 22, 44. Not a prime number.
    23: Factors are 1, 23. Prime number.
    150: Factors are 1, 2, 3, 5, 6, 10, 15, 25, 30, 50, 75, 150. Not a prime number.

  2. A number that is not a prime number is called a composite number.

    1. Prime numbers are already circled in the image.

    2. Example factors for numbers not coloured in:
      14: 1, 2, 7, 14.
      51: 1, 3, 17, 51.
      33: 1, 3, 11, 33.

    3. Underline the prime factors:
      14: 2, 7.
      51: 3, 17.
      33: 3, 11.

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