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MATHCOUNTS TOOLBOX Facts, Formulas and Tricks

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Lesson 8: Determining the Number of Factors of a Number

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First find the prime factorization (include the 1 if a factor is to the first power).

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Increase each exponent by 1 and multiply these new numbers together.

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Example: How many factors does 300 have?

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The prime factorization of 300 is 2 2 × 3 1 × 5 2.

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The prime factorization of 300 is 2 2 × 3 1 × 5 2. Increase each of the exponents by 1 and multiply these new values:

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(2+1) × (1+1)× (2+1) = 3× 2× 3 = 18. So 300 has 18 factors.

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Fini!

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Multiplication Facts All Facts. 0 x 1 2 x 1 10 x 5.

Multiplication Facts All Facts. 0 x 1 2 x 1 10 x 5.

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