Question: 2 times any number is even?
Answer: A simple rearranging of the terms above gives: 2n + 2m = 2(n + m). Therefore, any even number plus any other even number will always equal an even number (as the answer you get will always be some number multiplied by two). An odd number can be looked at as an even number with one added to it - e.g. 5 is 4+1.