Odd Even Sort

In Odd Even Sort topic, 1st Grade students will learn how to tell if a number is odd or even and sort numbers into the correct group. Children learn that even numbers can be split into two equal groups with nothing left over. They learn that odd numbers leave one extra when split into two equal groups. Students practice noticing patterns in the last digit of a number. This topic builds number structure, grouping, and logical thinking.

What Children Learn

Students learn the even number pattern and recognize that even numbers end in 0, 2, 4, 6, or 8. They learn odd numbers end in 1, 3, 5, 7, or 9. Children practice sorting mixed sets of numbers into odd and even groups. They practice checking using simple pairing ideas. As the work gets harder, students decide if a sum is odd or even, like 7 plus 5. They also explain how they know.

Sample Questions Children Practice

1. Which number is even

A. 27

B. 48

C. 59

D. 73

2. Fill in the blank: 35 is an ___ number

3. Which set has only odd numbers

A. 11, 13, 15

B. 12, 14, 16

C. 10, 21, 32

D. 18, 19, 20

4. Fill in the blank: An even number can be split into two ___ groups

5. Thinking question: If a number ends in 6, how do you know it is even

Why This Topic Matters

Odd and even help children understand patterns and grouping. This supports skip counting and future multiplication ideas. It also helps with checking answers, like noticing if a result makes sense. Sorting builds organization and careful thinking. These skills are useful across many math topics and real life situations.