Sorting and Classifying
Kindergarten · Math · Study Guide
Sorting means putting things into groups based on how they are alike. Let's learn to sort!
Sorting is one of the most useful skills in math and in life! When you sort, you look at a group of objects and put things that are alike together. You might sort by color, by size, by shape, or by what things are used for.
A rule tells you HOW to sort. 'Put all the red ones together' is a sorting rule. 'Put all the big ones here and the small ones there' is another sorting rule. Every sort needs a rule so you know which group each item goes into.
Classifying is a bigger word for the same idea — you're deciding what category an object belongs in based on its features. Does it have four legs? Is it round? Is it soft? Each question helps you classify the object.
When you finish sorting, you can count each group and compare. Which group has the most? Which has the fewest? This is where sorting connects to counting and comparing — all your math skills work together!
You can sort the same group of objects in different ways. A handful of buttons could be sorted by color, OR by size, OR by the number of holes. Each sorting rule creates different groups from the same objects. There's no single right way to sort — it depends on what you want to know!
| Sorting Rule | Group 1 | Group 2 | Group 3 |
|---|---|---|---|
| Sort by color | Red objects | Blue objects | Yellow objects |
| Sort by size | Big objects | Small objects | Medium objects |
| Sort by shape | Circles | Squares | Triangles |
| Sort by texture | Smooth objects | Rough objects | — |
| Sort by use | Things to eat | Things to wear | Things to play with |
Key terms
- sort
- To put objects into groups based on how they are alike
- classify
- To decide which category or group an object belongs to based on its features
- attribute
- A feature of an object like its color, size, or shape
- category
- A group of things that share the same feature
- sorting rule
- The feature you use to decide how to group things, like 'sort by color'
Practice questions
You have red, blue, and green crayons. You sort them by color. How many groups do you make?
- 1
- 2
- 3
- 4
Show answer
Answer: 3
You can only sort objects in one way — there is only one correct sorting rule for any group.
Show answer
Answer: False
A feature of an object like its color or size is called an ___.
Show answer
Answer: attribute
Which sorting rule groups a tennis ball, an orange, and a coin together?
- Sort by color
- Sort by shape (round)
- Sort by size
- Sort by texture
Show answer
Answer: Sort by shape (round)
After sorting objects into groups, you can count each group to find out which has the most.
Show answer
Answer: True
Fun facts
- Grocery stores are sorted! All the bread is in one aisle, all the vegetables in another. Stores are arranged using the exact same sorting and classifying ideas you're learning in kindergarten.
- Scientists who study animals classify them into groups called kingdoms, phyla, classes, and more. It's all based on how the animals are alike — sorting on a very grand scale!
- Your brain automatically sorts things all day long. When you see a dog, your brain instantly classifies it as an animal, a pet, something friendly — all in a fraction of a second!
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