What Are Odd Numbers? (Mathematics Lesson)
What Are Odd Numbers?Odd numbers are integers that cannot be divided exactly by 2.
How to Check if a Number Is an Odd NumberQuestion: Is 25 an odd number?
25 ÷ 2 = 12.5.
12.5 is not a whole number. 25 is an odd number.
Real Examples of Odd NumbersSome examples of odd numbers are:
FORMAL DEFINITION OF ODD NUMBERSA number n is odd if there exists an integer k, such that:
This means than n can never be divided exactly by 2 - if it is divided by 2 there will always be a remainder of 1.
A QUICK WAY TO CHECK IF A NUMBER IS AN ODD NUMBER
A number is odd if its last digit is 1, 3, 5, 7 or 9.