classify — Definition, Formula & Examples
Classify is to sort objects or numbers into groups based on a shared property, such as shape, size, color, or value.
To classify is to organize a set of elements into distinct categories according to one or more defined attributes, so that every element belongs to exactly one category within a given classification scheme.
How It Works
Pick a property you want to sort by, like shape or whether a number is even or odd. Look at each object and decide which group it belongs to. Place it in that group. When you are done, every object should be in exactly one group, and all objects in the same group should share the property you chose.
Example
Problem: Classify these numbers into "even" and "odd": 3, 8, 15, 22, 7, 10.
Choose the property: We are classifying by whether each number is even (divisible by 2) or odd (not divisible by 2).
Sort each number: Check each number: 3 is odd, 8 is even, 15 is odd, 22 is even, 7 is odd, 10 is even.
Write the groups: Even: 8, 22, 10. Odd: 3, 15, 7.
Answer: Even group: {8, 22, 10}. Odd group: {3, 15, 7}.
Why It Matters
Classifying is one of the first reasoning skills you use in math. It builds the foundation for understanding categories in geometry (types of triangles, types of quadrilaterals) and in data and statistics (organizing survey results into groups before making a graph).
Common Mistakes
Mistake: Using more than one property at the same time without realizing it
Correction: Decide on one clear property before you start sorting. If you classify shapes by color, do not also mix in size — unless you intentionally create sub-groups.