Odd or Even for 4th Grade

Odd and even numbers are one of the first patterns students use when classifying numbers. In Grade 4, that idea supports place value, multiplication, and problem solving.

A number is even if it can be split into two equal groups with no remainder. A number is odd if one item is left over when the number is split into two equal groups.

Detailed Explanation

The quickest way to decide whether a whole number is odd or even is to look at the ones digit. Numbers ending in 0, 2, 4, 6, or 8 are even.

Numbers ending in 1, 3, 5, 7, or 9 are odd. This rule works for small and large numbers because the ones digit determines whether the entire number can be divided into pairs.

Worked Example

Problem: Is 378 odd or even?

1. Look at the ones digit.
2. The ones digit is 8.
3. Since 8 is one of the even digits, the whole number is even.

Answer: 378 is even.

Practice Tip

Ask students to sort a mixed list of numbers into odd and even groups and explain each choice using the ones digit rule.

Common Mistakes

Students usually improve faster in odd or even when they slow down and watch for a few repeated mistakes. These are the ones worth checking first:

• Rushing past the rule or pattern before deciding what the problem is asking.
• Skipping a quick check to see whether the answer is reasonable.
• Confusing the final answer with an intermediate step.

Practice Strategy

A short but consistent review routine helps students build confidence with odd or even without getting overwhelmed.

• Practice a few short problems on odd or even every day for a week.
• Explain the rule in words after solving each problem.
• Use estimation, a model, or an inverse operation to check your work.

Frequently Asked Questions

How can you tell if a number is odd or even?

Look only at the ones digit. If it is 0, 2, 4, 6 or 8, the number is even. If it is 1, 3, 5, 7 or 9, the number is odd. This works for any whole number, however large. For example, 5,374 is even because it ends in 4, and 9,861 is odd because it ends in 1.

Is 4 odd or even?

4 is an even number. It can be split into two equal groups of 2 with nothing left over, and it ends in the even digit 4. Every number that ends in 4, such as 14, 284 or 1,004, is also even, because the ones digit decides whether a number can be put into pairs.

How do you explain odd and even numbers to kids?

Use objects and pairs. Give a child a handful of counters and ask them to line them up in pairs. If every counter has a partner, the number is even. If one counter is left alone, the number is odd. With 7 counters you get 3 pairs and 1 left over, so 7 is odd. Fourth graders can then link this to the ones digit rule.

Is there an odd and even worksheet for grade 4?

Yes. The practice problems after the lesson can be used as a grade 4 odd and even worksheet. For more, list a mix of two-, three- and four-digit numbers and have your child sort them into odd and even columns, explaining each choice with the ones digit. You can also ask whether the sum of two odd numbers is odd or even (it is always even).

Keep Practicing

After finishing this lesson on odd or even, spend a few minutes on mixed review so the skill stays connected to the rest of Grade 4 math.

Need more Grade 4 review? Explore the Grade 4 Mathematics Worksheets hub for extra guided practice, review sets, and printable support.