What is an Odd Number?
An integer that is not divisible by two. Odd numbers have a remainder of one when divided by two.
An odd number is any whole number that cannot be divided evenly by 2. When you divide an odd number by 2, there is always a remainder of 1. Examples of odd numbers include 1, 3, 5, 7, 9, 11, 13, and so on.
Just like even numbers, odd numbers can also be negative. For example, –3 and –7 are odd because when you divide them by 2, there is still a remainder of 1.
We see odd numbers all around us, like:
- Counting steps in a staircase when there’s an uneven number
- Splitting a group of 5 toys into two equal parts—one is always left over
- Arranging chairs in a circle where one seat doesn’t have a pair
When Do Students Learn About Odd Numbers?
Students are introduced to odd numbers when they begin learning about counting and grouping objects, usually starting in early elementary school.
Preschool & Kindergarten – Early Introduction
Students learn to recognize odd and even patterns while counting.
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Grades 1–2 – Understanding Odd Numbers
Students practice identifying odd numbers up to 100 and learn to recognize patterns in sequences.
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Grades 3–5 – Applying Odd Numbers
Students begin using odd numbers in multiplication, division, and problem-solving activities.
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