Factor Trees (Factoring Numbers)

The Factor Trees Gizmo has two modes. In Factor mode, you can create factor trees to factor composite numbers into primes. In Build mode, you can build numbers by multiplying primes together. Can you build all composite numbers up to 50? Any whole composite number up to 999 can be factored or built with the Gizmo.

  Launch Gizmo


  • Understand that some numbers, called prime numbers, have only two factors - one and themselves.
  • Understand that other numbers, called composite numbers, have multiple prime factors.
  • Factor composite numbers into prime numbers.
  • Build composite numbers by multiplying primes.
  • Use factors to understand multiples and divisibility.
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