Is 1 an odd number? Numbers parity

1: even or odd number?

The number 1 is odd.

A number is odd if it is not divisible by 2.


The number 1 is odd, because it is not divisible by 2: the remainder is 1 when divided by 2.


How to recognize an odd number: its last digit, the one that is in the ones place (the first digit of the number counted from the right), is: 1, 3, 5, 7 or 9.


Mathematically, the odd numbers can be written as:
2 × k + 1, where k ∈ Z, the set of integer numbers

Operating rules

When working with even and odd numbers, the following rules apply:


Addition: even + even = even; even + odd = odd; odd + odd = even.


Subtraction: even - even = even; even - odd = odd; odd - odd = even.


Multiplying: even × even = even; even × odd = even; odd × odd = odd.


The latest 5 checked on numbers: even or odd number?

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The list of all the checked on numbers: is it an even or an odd number?

Online calculator: is the number even or odd?

The even numbers have the digit in the ones place (the first digit of the number counting from the right) equal to 0, 2, 4, 6, or 8.

The odd numbers have the digit in the ones place (the first digit of the number counting from the right) equal to 1, 3, 5, 7, or 9.

1. Tutoring: Even or odd? Integer numbers parity. 2. Examples of even and odd numbers. 3. The last digit of numbers. 4. Formal definition

1. Numbers' parity: even or odd?

2. Examples of even and odd numbers:

3. The numbers' last digit

4. Formal definition of even and odd numbers:

Did you know?

Some articles on the prime numbers

What is a prime number? Definition, examples

What is a composite number? Definition, examples

The prime numbers up to 1,000

The prime numbers up to 10,000

The Sieve of Eratosthenes

The Euclidean Algorithm

Completely reduce (simplify) fractions to the lowest terms: Steps and Examples