---
title: "Grouping Materials"
description: "Compare and group everyday materials based on their simple physical properties"
canonical: https://lightmysky.com/learn/science/grouping-materials-mt_SwaNNdm_Ks
source: https://lightmysky.com/learn/science/grouping-materials-mt_SwaNNdm_Ks.md
retrieved: 2026-10-19
---

> **Agent view.** This is the Markdown twin of the page, for tools and assistants.
> When to use this site, and the call that answers each job: https://lightmysky.com/agent-instructions.md
> API description (OpenAPI 3.1): https://lightmysky.com/openapi.json · Authentication: https://lightmysky.com/auth.md
> Pricing: https://lightmysky.com/pricing.md · Catalog: https://lightmysky.com/llms.txt · Full catalog: https://lightmysky.com/llms-full.txt
> Every machine-readable file on this domain: https://lightmysky.com/.well-known/ai-catalog.json
> Ask for Markdown with `Accept: text/markdown`, a `.md` address, or `?mode=agent`.

# Grouping Materials

Compare and group everyday materials based on their simple physical properties

Subject: Science · Area: Matter & Materials · Ages 5 to 6
Page: https://lightmysky.com/learn/science/grouping-materials-mt_SwaNNdm_Ks

## Ready when they can

- 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

## Lesson: Grouping materials

You know that materials have properties. Some are hard, some are soft. Some are shiny, some are dull. Things can also be waterproof or not, see-through or not, heavy or light. You can use these properties to make groups.

**Example.** Sam has a marble, a sponge, and a rock. The marble and the rock are hard. The sponge is soft. Sam makes two groups: hard and soft.

*(drawing: Two groups: hard things and soft things.)*

**Example.** A glass cup and a paper cup can both hold water. But the glass cup is see-through. The paper cup is not. They share one thing. They differ in another.

**Tip.** To group things, pick one property first. Then check each item one by one. Ask: does it have that property?

Grouping has a method. Pick one property first, like hard or shiny. Then check each thing: does it have that property? In the group or out. A good group always has a reason you can say out loud, like these are all bendy. If the reason is not true for every thing in the group, the group is wrong.

**Recap.** Pick a property, then sort things by it, and say why.

## Practice

24 questions on this page, each with its working shown.

## Needs first

- [Describing Material Properties](https://lightmysky.com/learn/science/describing-material-properties-mt_auVZZEuXjs)

## Opens up

- [Properties of rocks](https://lightmysky.com/learn/science/properties-of-rocks-mt_R6YoRXkRxS)
- [Choosing the Right Material](https://lightmysky.com/learn/science/choosing-the-right-material-mt_rTn43s8RNX)
- [Solids, Liquids & Gases](https://lightmysky.com/learn/science/solids-liquids-and-gases-mt_YQkUdIHO8L)
- [Classifying Materials](https://lightmysky.com/learn/science/classifying-materials-mt_zHnOGwHIEz)