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MAT0018 Additional resources - Oliver: Rainbow method to find all factors of a number

Additional resources that may prove useful to MAT0018 Developmental I math students

Rainbox Method

  • To find all the factors of a number, start with 1 (..and the number)
    • Then decide if 2 is a factor, then 3, then 4 (..they all divide evenly into 48)
    • Notice that 5 is not a factor ( doesn't divide evenly into 48)    
  • You can stop at 6. because the numbers now meet.          


  • You would write the answer like this (1, 2, 3, 4, 6, 8, 12, 16, 24, 48)
  • Here's another example:


  • ...and another


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