• Fractions
  • Preparing for fractions: the part–whole relationship
  • Mastery PD Materials

Preparing for fractions: the part–whole relationship

Spine 3: Fractions – Topic 3.1


Identify parts and wholes of areas, lengths and sets. Identify equal and unequal parts; make judgements about the relative size of a part to a whole. Find the whole when the size of a part and number of equal parts is known.

Teaching points

  • Teaching point 1: Any element of a whole is a part; if a whole is defined, then a part of this whole can be defined.
  • Teaching point 2: A whole can be divided into equal parts or unequal parts.
  • Teaching point 3: The relative size of parts can be compared.
  • Teaching point 4: If one of the equal parts and the number of equal parts are known, these can be used to construct the whole.


  • Primary
  • KS2
  • Year 3
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