Question 338559
Odd number plus an odd number equals an even number. 
Example:{{{3+5=8}}}
An even number is always 1 more than an odd number. 
Example:{{{4=3+1}}}
So when you add two odd numbers, you are really adding an odd number plus 1 plus another odd number plus 1. 
Odd number plus an odd number is even, as you saw from above. 
An even number plus 2 is an even number.
Example:{{{2+2=4}}} 
So an even number plus an even number equals an even number.