What are odd and even numbers?

You may have heard about odd and even numbers, but what exactly are they? Let’s explore even and odd numbers in more detail and look at examples from 1 to 100.

icon of a star with a smiley face

Author
Gary Ferguson

Last Updated
July 12, 2023

What are odd and even numbers?

You may have heard about odd and even numbers, but what exactly are they? Let’s explore even and odd numbers in more detail and look at examples from 1 to 100.

icon of a star with a smiley face

Author
Gary Ferguson

Last Updated
July 12, 2023

What are odd and even numbers?

You may have heard about odd and even numbers, but what exactly are they? Let’s explore even and odd numbers in more detail and look at examples from 1 to 100.

icon of a star with a smiley face

Author
Gary Ferguson

Last Updated
July 12, 2023

Key takeaways

  • All even numbers are divisible by 2 and leave a remainder of 0. 
  • All odd numbers are integers that are not divisible by 2.
  • Zero is considered and even number in math.
  • According to Common Core standards, even and odd numbers are introduced in second grade.

What are odd and even numbers?

Even numbers are divisible by 2, while odd numbers aren’t. 

This means that if you divide an even number by 2, you’ll always get a whole number result (e.g. 10/2 = 5). On the other hand, if you divide an odd number by 2, you’ll get a fractional result (e.g. 9/2 = 4.5).

Keeping this rule in mind can be really helpful when it comes to doing things like additionsubtractionmultiplication and division

In fact, this divisibility rule can be applied to any even or odd number, not just those between 1 and 100!

Unlock unlimited math questions

Put your skills to the test with fun exercises + maths games that are proven to boost ability!

Examples of odd and even numbers

Odd numbers 1 to 100

Below is a list of all odd numbers from 1 to 100:

1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99.

Even numbers 1 to 100

Below is a list of all even numbers from 1 to 100:

2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100.

Try DoodleMath for Free!

Select a grade

  • Counting

  • Operations

  • Base ten

  • Measurement and data

  • Geometry

  • Fractions

Sample questions

7 even and odd number activities

There are lots of things that you can do to explore odd and even numbers with your child including skip counting or practicing multiplication and division. Here are seven ideas for practicing odd and even numbers:

  1.  See if you can find any patterns with odd and even numbers
  2. Have a competition with a friend or family member to see who can get to 100 first by only adding odd or even numbers
  3.  See who can make the biggest odd or even number using the digits 1-9
  4. Try to find as many different odd and even numbers as you can
  5. See if you can make a number sentence using odd and even numbers (e.g. 3+5=8 or 9+1=10)
  6. Have a go at the ‘Odd One Out’ game; you’ll need a partner for this. One person thinks of an odd number between 1-100, and the other person has to guess what it is! The guessing person can only ask if the number is odd or even. The person who is thinking of the number can only say ‘yes’ or ‘no’.
  7. Try to solve riddles like: I am an odd number. Take away one letter, and I become even. What number am

Explore numbers with DoodleMath

Want to learn more about odd and even numbers? DoodleMath is an award-winning math app that’s proven to double a child’s rate of progression with just 10 minutes of use a day!

Filled with fun, interactive questions aligned to state standards, Doodle creates a unique work program tailored to each child’s needs, boosting their confidence and skills in math. Try it free today!

for families

Benefits of learning about odd and even numbers

Knowing whether a number is odd or even can be helpful in lots of situations. For example, when adding or subtracting numbers, you can pair up odd numbers with odd numbers and even numbers with even numbers to make calculations easier. 

For multiplication and division questions, you can also use the fact that odd numbers always give odd results when multiplied together, and even numbers always give even results (except 0).

Did you know....

All odd numbers end in 1, 3, 5, 7 and 9. As a result, every odd number written in word form ends in the letter ‘e’.  Isn’t that cool?!

FAQs about odd and even numbers

Most students are introduced to the concept of odd and even numbers in first or second grade. According to common core math standards, odd and even numbers are introduced in second grade.

Odd numbers from 1 to 100 include: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99.

Even numbers from 1 to 100 include: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100.

Integers can only be even or odd. No number is both even and odd.

Zero is considered an even number in math.

All prime numbers except for 2 are odd. This is because a prime number can only be divided by 1 and itself. Therefore, the result will always be an odd number.

Some examples of prime numbers are:

3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47.

Related Posts

Positive
Numbers

Negative Numbers

negative numbers on number line

Composite Numbers

Parents, sign up for a free subscription to the DoodleMath app and see your child become a math wizard!

Login

Are you a parent, teacher or student?

Get started for free!

Are you a parent or teacher?

Maths information pack

We ask for your contact info so we can send our info pack directly to your inbox for your convenience

Exam prep information pack

We ask for your contact info so we can send our info pack directly to your inbox for your convenience

Case studies information pack

We ask for your contact info so we can send our info pack directly to your inbox for your convenience

Information pack

We ask for your contact info so that our Education Consultants can get in touch with you and let you know a bit more about Doodle.

Student Login

Which programme would you like to use?

If you’d like to use Doodle’s browser version, please visit this page on a desktop.

To log in to Doodle on this device, you can do so through our apps. You can find out how to download them here: