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Topic: Multiplication and Division B2.6 – Identifying Prime and Composite Numbers

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Ontario Curriculum Expectation:

6.B2.6 represent composite numbers as a product of their prime factors, including through the use of factor trees


    Factors are numbers that are multiplied to get a product.

    2 × 4 = 8 2 and 4 are factors of 8

    1 × 8 = 8 1 and 8 are factors of 8

    The factors of 8 are: 1, 2, 4, and 8.

     

    Prime numbers only have two factors.

    1 × 7 = 7 1 and 7 are the only factors of 7

    7 only has two factors so it is a prime number.

     

    Composite numbers have more than two factors.

    2 × 3 = 6 2 and 3 are factors of 6

    1 × 6 = 6 1 and 6 are factors of 6

    The factors of 6 are: 1, 2, 3, and 6.

    6 has more than two factors, so it is a composite number.