And i realized that when you add an uneven number with another uneven number… you will always have even numbers as a result. ( 1 + 1 = 2, 3 + 7 = 10)
When you add two even numbers you get also an even number as a result. ( 2 + 2 = 4, 4 + 4 = 8 )
However when you add an even and an odd number the result is going to be always an uneven number. ( 3 + 4 = 7, 23 + 28 = 51 )
Cant remember learning this law in school.