Even and Odd Numbers Introduction
Numbers can be split into two groups: even numbers and odd numbers.
An even number can be shared equally between 2 friends with nothing left over. An odd number always has 1 left over when shared between 2.
What is Even and Odd Numbers Introduction - Class 1 Maths (Numbers up to 100)?
Even numbers end in 0, 2, 4, 6, or 8. They can be split into 2 equal groups.
Odd numbers end in 1, 3, 5, 7, or 9. They cannot be split into 2 equal groups — there is always 1 left over.
| Even Numbers (1–20) |
|---|
| 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 |
| Odd Numbers (1–20) |
| 1, 3, 5, 7, 9, 11, 13, 15, 17, 19 |
Solved Examples
Example 1: Is 6 Even or Odd?
Question: Is 6 even or odd?
Think:
- 6 ends in 6
- 6 is in the list: 0, 2, 4, 6, 8
- Also: 6 objects can be split into 2 groups of 3 with nothing left
Answer: 6 is an even number.
Example 2: Is 7 Even or Odd?
Question: Is 7 even or odd?
Think:
- 7 ends in 7
- 7 is in the list: 1, 3, 5, 7, 9
- 7 objects split into 2 groups: 3 and 3 with 1 left over
Answer: 7 is an odd number.
Example 3: Share 8 Mangoes
Question: Ria has 8 mangoes. Can she share them equally with Priya?
Think:
- Give 1 to Ria, 1 to Priya, 1 to Ria, 1 to Priya...
- Ria gets 4, Priya gets 4 — nothing left
Answer: Yes. 8 is even, so it can be shared equally. Each gets 4 mangoes.
Example 4: Share 5 Toffees
Question: Aman has 5 toffees. Can he share them equally with Kavi?
Think:
- Aman gets 2, Kavi gets 2, but 1 is left over
- They cannot share equally
Answer: No. 5 is an odd number. There is 1 toffee left over.
Example 5: Even or Odd: 12
Question: Is 12 even or odd?
Think:
- 12 ends in 2
- 2 is in the even list: 0, 2, 4, 6, 8
Answer: 12 is even.
Example 6: Even or Odd: 15
Question: Is 15 even or odd?
Think:
- 15 ends in 5
- 5 is in the odd list: 1, 3, 5, 7, 9
Answer: 15 is odd.
Example 7: Pairing Objects
Question: Meera has 10 beads. She pairs them up. Are any left without a pair?
Think:
- 10 beads → 5 pairs, 0 left over
- 10 is even
Answer: No beads are left. 10 is even.
Key Points to Remember
- Even numbers end in 0, 2, 4, 6, or 8. They can be split into 2 equal groups.
- Odd numbers end in 1, 3, 5, 7, or 9. They always have 1 left over when split into 2.
- To check: look at the last digit (ones digit) of the number.
- Even and odd numbers alternate: 1 (odd), 2 (even), 3 (odd), 4 (even), ...
- 0 is an even number.
Practice Problems
- Is 9 even or odd?
- Is 14 even or odd?
- Write all even numbers from 1 to 20.
- Ria has 11 stickers. Can she share them equally with her friend?
- Circle the odd numbers: 2, 5, 8, 13, 16, 19.
- Is 0 even or odd?
Frequently Asked Questions
Q1. What is an even number?
An even number can be divided into 2 equal groups with nothing left over. It ends in 0, 2, 4, 6, or 8.
Q2. What is an odd number?
An odd number cannot be split into 2 equal groups. There is always 1 left over. It ends in 1, 3, 5, 7, or 9.
Q3. How do I quickly tell if a number is even or odd?
Look at the last digit (ones place). If it is 0, 2, 4, 6, or 8 → even. If it is 1, 3, 5, 7, or 9 → odd.
Q4. Is 0 even or odd?
0 is even. It can be divided into 2 equal groups of 0 with nothing left over.
Q5. Is 1 even or odd?
1 is odd. You cannot split 1 object into 2 equal groups.
Q6. Do even and odd numbers take turns?
Yes. The pattern alternates: 1 (odd), 2 (even), 3 (odd), 4 (even), and so on forever.
