Identify Odd and Even Numbers
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What you will learn
- 1Identify whether any number is odd or even by looking at its ones digit
- 2Recite the five even ones digits (0, 2, 4, 6, 8) and five odd ones digits (1, 3, 5, 7, 9)
- 3Explain the pairing rule for odd and even numbers
Mini Lesson
Every whole number is either even or odd — and the quickest way to find out is to look at just one digit: the ones digit!
Even numbers
- A number is even if its ones digit is 0, 2, 4, 6, or 8.
- Even numbers can be split into two equal groups with nothing left over.
- Count by 2s and you say only even numbers: 2, 4, 6, 8, 10, 12. More even numbers: 36, 148, 720.
Odd numbers
- A number is odd if its ones digit is 1, 3, 5, 7, or 9.
- Odd numbers always have one left over when you try to split them equally.
- Examples: 7, 13, 45, 231, 809 — all end in an odd digit, all are odd.
The ones digit is the only one that matters
- It does not matter what the hundreds or tens digits are.
- 598 ends in 8 → even. 597 ends in 7 → odd.
- The hundreds digit 5 makes no difference — only the 8 or 7 at the end counts.
Words to know
Even
A number that ends in 0, 2, 4, 6, or 8
e.g. 148 is even because it ends in 8.
Odd
A number that ends in 1, 3, 5, 7, or 9
e.g. 231 is odd because it ends in 1.
Ones digit
The last digit on the right of a number
e.g. The ones digit of 597 is 7.
Pair
Two things grouped together
e.g. Even numbers can be split into pairs with none left over.
Equal groups
Groups that all have the same number of items
e.g. Even numbers split into two equal groups.
Ask yourself: "What is the ones digit? Is it in the even group (0, 2, 4, 6, 8) or the odd group (1, 3, 5, 7, 9)?"
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