Science // Matter & Materials

Grouping Materials

Compare and group everyday materials based on their simple physical properties

Ages
5 to 6
Type
Method
Builds on
1 topic
Leads to
4 topics
Standards
1 code

Quick check

Can the learner sort a pile of objects into groups based on their properties, like all the waterproof ones together or all the transparent ones?

Ask this to see whether the topic is secure.

Topic // Mastery

What mastery looks like

What a learner can do once this topic is secure.
  • Sort a set of materials into groups based on a chosen property (e.g. transparent vs opaque)
  • Compare two materials and state which properties they share and which differ
  • Explain the reasoning behind a grouping decision using property vocabulary

Topic // Map

Where this fits

What to learn first and what this topic opens up, with the reason for each link. Required links come first.
  • RequiredMust come first
  • HelpfulHelps, but not essential

Before this

1 topic

You are here

Grouping Materials

Ages 5 to 6 // Method

Leads to

4 topics
  • Choosing the Right MaterialRequired

    Matter & Materials // Ages 6 to 8

    Must group materials by properties before evaluating suitability for purposes

  • Classifying MaterialsRequired

    Matter & Materials // Ages 7 to 8

    Must be able to group materials before conducting investigation to classify by properties

  • Solids, Liquids & GasesRequired

    Matter & Materials // Ages 8 to 9

    Must group materials by properties before classifying into three states of matter

  • Properties of materialsHelpful

    Earth's Systems // Ages 7 to 8

    Grouping materials by properties supports grouping rocks by properties

Topic // Research-informed

Teaching notes

From the Marble Skill Taxonomy. These notes have not been validated in classrooms, so treat them as a starting point for your own judgement.

The approach

For 5–6 year olds learning to compare and group everyday materials by simple physical properties. The core objective is that children sort a real set of materials by a stated property, justify each placement with a property word, and — crucially — re-sort the SAME set by a different property to discover that groups depend on the chosen rule, not on a fixed identity of the object. Activities centre on hands-on sorting with real materials; a drag-to-sort surface, a tap-to-reveal illustrated sort, and a short categorisation check are included as complementary supports with their limits noted.

Common misconceptions

  • Believing a material has one fixed group, not realising the same set re-sorts differently when the property changes (a Patterns-concept hurdle).
  • Sorting by the object's identity or use (all the cups together) instead of by the stated physical property.
  • Grouping by irrelevant surface features (colour, size) rather than the chosen property.
  • Placing an item without a rule — grouping intuitively and being unable to justify it in property words.
  • Assuming a material can only ever be in one group, so an item that is both shiny and hard can't belong to two overlapping sorts.

Useful representations

  • Sorting hoops / trays labelled by a property (transparent | opaque)
  • A two-material compare frame: 'same' column and 'different' column
  • A regroupable set the child sorts, then re-sorts by a new property
  • A simple Carroll/Venn-style two-way mat for a later 'shiny AND hard' sort
  • Property-word tags the child attaches to each group to state the rule

Teaching practices

  • Begin with one clear either/or property (transparent vs opaque) so the sorting rule is unambiguous before introducing finer distinctions.
  • Require the child to name the sorting rule and justify each placement with a property word, making the reasoning explicit rather than intuitive.
  • Re-sort the same materials by a different property so children learn that groups depend on the chosen rule, not on a fixed property of the object — the core of the Patterns crosscutting concept.
  • Use direct pair comparison ('same/different') as a stepping stone from describing one material to grouping many.
  • Keep the sort hands-on with real materials and physical hoops/trays; concrete sorting is the KS1 route into classification.
  • Include ambiguous or multi-property items to prompt discussion ('could this go in either group? why?'), treating disagreement as reasoning practice.

Activities to try

  1. 1

    Sort real materials, then re-sort by a new rule

    Why it works: A group is not a fixed fact about an object; it depends on the property you choose to look at. The same material can belong with different partners under different rules.

    1. Lay out a tray of real materials: wood block, glass jar, metal key, plastic toy, sponge, foil, fabric.
    2. Choose ONE property and say the rule out loud before touching anything (e.g. 'see-through vs not see-through').
    3. Sort every item into two hoops or trays, saying a property word for each placement ('I put the glass jar with the clear plastic toy because you can see through both').
    4. Now sort the SAME items again, but pick a DIFFERENT property (e.g. bendy vs stiff, or hard vs softer). Notice which items move home.
    5. Point out an item that changed groups and say why (e.g. 'the foil was with the wood for not see-through, but with the fabric and sponge for bendy'; the glass only leaves the plastic under 'hard' if the plastic toy is soft or squashy).
  2. 2

    Same-and-different pair comparison

    Why it works: Comparing two materials by naming a shared and a differing property is the bridge from describing one material to grouping many.

    1. Take just two materials at a time (e.g. glass jar and clear plastic toy; or wood block and metal key).
    2. Say one property they SHARE ('both are hard' or 'you can see through both').
    3. Say one property where they DIFFER ('the glass is see-through but the wood is not').
    4. Record each in a 'same' column and a 'different' column, using property words.
    5. Repeat with other pairs so comparing becomes a stepping stone into sorting a larger jumble.
  3. 3

    Read a finished sort and explain each placement (illustrated support)

    Why it works: Each group follows a property rule, and the same items can be arranged differently under a different rule — reinforcing the vocabulary and hinting at rule-dependence.

    1. Look at a completed transparent/opaque grouping of pictured materials.
    2. Tap or point to any item to hear or say the property reason it sits where it does ('this is here because you can see through it').
    3. Then look at the same items shown re-sorted by a new rule (e.g. waterproof vs absorbent) and notice which pictures moved.
    4. Say which item changed group and why.

Topic // Standards

Curriculum standards

Codes for the curriculum statements this topic maps to. Each publisher owns its standard text.
The national curriculum in England: Key stages 1 and 2 framework document
Y1.Sci.EM.4

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