Even and Odd Numbers 1 to 20
Parity of numbers 1 through 20. Even numbers end in 0, 2, 4, 6, or 8; odd numbers end in 1, 3, 5, 7, or 9.
The rhythm never breaks — odd, even, odd, even from 1 to 20: exactly 10 of each. Sums follow rules of their own: even + even stays even, odd + odd flips to even, and mixed pairs stay odd — parity is the fastest sanity check in arithmetic.
| Number | Parity |
|---|---|
| 1 | odd |
| 2 | even |
| 3 | odd |
| 4 | even |
| 5 | odd |
| 6 | even |
| 7 | odd |
| 8 | even |
| 9 | odd |
| 10 | even |
| 11 | odd |
| 12 | even |
| 13 | odd |
| 14 | even |
| 15 | odd |
| 16 | even |
| 17 | odd |
| 18 | even |
| 19 | odd |
| 20 | even |
Frequently asked questions
What are the even numbers from 1 to 20?
The even numbers up to 20 are 2, 4, 6, 8, 10, 12, 14, 16, 18, 20.
How do you tell if a number is even or odd?
Look at the last digit: 0, 2, 4, 6, or 8 means even; 1, 3, 5, 7, or 9 means odd. The rest of the number never changes parity.
Is 0 even or odd?
0 is even — it fits the rule (ends in 0) and 0 = 2 × 0, so it divides by 2 with no remainder.