Odd and even numbers
An integer is even if, when it is divided by two, the result is another integer.
Zero is also even because 0/2 = 0
One isn’t even because one divided by two is 
All the numbers ending in 0, 2, 4, 6 or 8 produce an integer when they are divided by two. They are all even.
All the numbers ending in 1, 3, 5, 7 or 9 produce a fraction when they are divided by two. They are all odd.
