Sort objects into categories

Sorting objects into categories means classifying a collection according to a stated observable attribute, such as color, shape, size, or use, and placing each object in the category whose rule it satisfies. The learner understands that the same objects may be regrouped using a different attribute and that category counts describe the resulting data; formal set notation, overlapping classifications, and multi-attribute tables are beyond this level.

Detailed Explanation: Sort objects into categories

To sort objects, choose one rule and put each object with the other objects that have the same attribute.

Example: Sort these blocks by color:

🔴 🔵 🟢 🔴 🟢 🔵

Choose the rule: We will sort by color.
Look at one block at a time.
- Put the red blocks together.
- Put the blue blocks together.
- Put the green blocks together.
Check each block: Every block belongs in the group with its color.

The groups are:

Red: 🔴 🔴 — $2$ blocks
Blue: 🔵 🔵 — $2$ blocks
Green: 🟢 🟢 — $2$ blocks

All the blocks are sorted, and each block is in the category that matches its color.

Learn by doing: Sort objects into categories

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