Is 30 an Even or an Odd Number? Numbers' Parity: How To Determine if a Number Is Even or Odd? Operating Rules When Working With Even and Odd Numbers
30: even or odd number?
A number is even if it is divisible by 2.
The number 30 is even, because it's divisible by 2: the remainder is zero when divided by 2.
How to recognize an even number: its last digit, the one that is in the ones place (the first digit of the number counted from the right) is: 0, 2, 4, 6, or 8.
Mathematically, the even numbers can be written as:
2 × k, where k ∈ Z, the set of integer numbers
The number 30 is even.
Operating rules (scroll down...)
When working with even and odd numbers, the following rules apply:
Addition:
even + even = even; even + odd = odd; odd + odd = even
Examples:
2 + 4 = 6 (even); 1 + 2 = 3 (odd); 1 + 3 = 4 (even).
Subtraction:
even - even = even; even - odd = odd; odd - odd = even
Examples:
4 - 2 = 2 (even); 2 - 1 = 1 (odd); 3 - 1 = 2 (even).
Multiplying:
even × even = even; even × odd = even; odd × odd = odd
Examples:
2 × 4 = 8 (even); 2 × 3 = 6 (even); 3 × 5 = 15 (odd).
Other similar operations with even / odd numbers:
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.