What are odd and even numbers?

In this guide, we explain what odd and even numbers are and explore all of the numbers from 1 to 100!

Author
Gary Ferguson

Published
July 29, 2022

What are odd and even numbers?

In this guide, we explain what odd and even numbers are and explore all of the numbers from 1 to 100!

Author
Gary Ferguson

Published
July 29, 2022

What are odd and even numbers?

Let’s learn what odd and even numbers are and explore them from 1 to 100!

Author
Gary Ferguson

Published
July 29, 2022

Key takeaways

• Even numbers are divisible by 2, while odd numbers aren’t
• There are lots of easy ways that make it easy to identify odd and even numbers – such as the fact that all odd numbers have the letter ‘e’ in them!

You may have heard lots about odd and even numbers, but what exactly are they? In this blog, we’ll explore this in more detail and look at examples of odd and even numbers from 1 to 100.

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, the result won’t be a whole number (e.g. 9/2 = 4.5).

Keeping this rule in mind can be really helpful when it comes to doing things like addition, subtraction, multiplication and division.

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

Ready to test your knowledge? Have a go at our interactive practice questions!

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Examples of odd and even numbers

Odd numbers 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

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.

How to recognise odd and even numbers up to 100

Check out our step-by-step video for some super easy ways to recognise odd and even numbers! Be sure to check out our bank of topic walkthroughs for even more guides (perfect for sharing with your child or in class!).

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Odd and even number FAQs

What are the 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, in multiplication and division questions, you can use the fact that odd numbers always give odd results when multiplied together, and even numbers always give even results.

When do children learn about odd and even numbers?

As outlined in the national curriculum, pupils start to learn about odd and even numbers in Key Stage 1:

“They practise counting as reciting numbers and counting as enumerating objects and counting in 2s, 5s and 10s from different multiples to develop their recognition of patterns in the number system (for example, odd and even numbers).”

Is 0 an even number?

It might seem strange, but yes! This is because dividing 0 by 2 gives you 0, which is a whole number.

Is 1 an odd number?

Yes, 1 is an odd number. All numbers that aren’t divisible by 2 are odd numbers. This includes 1, 3, 5, 7, 9, 11, 13 and so on.

Do all odd numbers have an 'e' in them?

How cool is this? Odd numbers need to end in 1, 3, 5, 7, 9, and as a result, each number has a letter ‘e’. Mind = blown!

Are all prime numbers odd?

Prime numbers are odd because they can’t be divided by 2 to give a whole number – except for 2 itself, which is the only even prime number!

Here are some examples of odd prime numbers:

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

Explore odd and even numbers with DoodleMaths

DoodleMaths is an award-winning maths app that’s filled with games and questions covering the EYFS, KS1 and KS2 curriculum!

Designed to be used for just 10 minutes a day, it creates every child a unique learning experience tailored to their needs, boosting their confidence and ability in maths.

Created by teachers, it automatically targets tricky topics and tops up each child’s knowledge, helping them get ahead in their learning. Why not try it for free today?

Odd and even number activities

There are lots of things that you can do to explore odd and even numbers with your child or pupils.

• You can learn about them by counting different objects
• You can try counting in 2s, 5s, and 10s
• You can explore what happens when you divide odd and even numbers by each other

Finally, you can try some fun activities together with a friend or family member.

Here are some odd and even number activities that you can try:

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 to 9

4. Try to find as many different odd and even numbers as you can

5. Try to solve riddles; for example:

I am an odd number. Take away one letter, and I become even. What number am I?

We hope you have fun with these odd and even number activities!

In summary...

Even though odd and even numbers seem simple enough, it can be helpful to have a basic understanding of what they are. This knowledge becomes especially helpful when doing things like addition, subtraction, multiplication and division.

We hope you’ve found this article helpful in learning more about these two types of numbers! For even more ways to explore odd and even numbers, don’t forget to download the DoodleMaths app. It’s filled with thousands of fun, interactive exercises – and is proven to boost confidence and ability in maths!

Answer to riddle: seven (take away the letter ‘s’ and it becomes ‘even’!)

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