With regard to odd numbers and even numbers, there are the following properties: (1) odd numbers will not be even numbers at the same time; Two consecutive integers must be odd and even. (2) The sum of odd numbers and odd numbers is even; The sum of even and odd numbers is odd; The sum of any number of even numbers is even. (3) The difference between two odd (even) numbers is even; The difference between even and odd numbers is odd numbers. (4) If A and B are integers, the parity of a+b and a-b is the same, that is, a+b and a-b are both odd or even. (5) The product of n odd numbers is odd, and the product of n even numbers is a multiple of 2n; If one cis is even, the product is even, that is, a * b * c *……* ... * even * x * y = even, where a, b, c, ... x, y are integers, and the formula can be simplified as: odd * even = even. (6) Odd numbers are 1, 3, 5, 7 and 9; Even numbers are 0, 2, 4, 6 and 8. 0 is a special even number. In 2002, the International Mathematical Association stipulated that zero was an even number, and in 2004, China also stipulated that zero was an even number. Elementary school stipulated that 0 is the smallest even number, but by junior high school, I learned negative numbers. When there are negative even numbers, 0 is not the smallest even number. )
Odd numbers are odd numbers, which people call odd numbers in their daily lives. The number divisible by 2 is odd.