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Year 4 · Multiplication

Factors of a number

A factor divides into a number exactly, with nothing left over.

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How to do it

  1. Start at 1 and try each number.
  2. If it divides exactly, it is a factor (and so is its partner).
  3. Stop when the pairs start to repeat.

Worked example

Which of these is a factor of 20?
A factor divides exactly with no remainder. The factors of 20 are 1, 2, 4, 5, 10, 20, so 2 is a factor.
Answer: 2

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Factors come in pairs that multiply to the number.

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