Let us think about even numbers. 2, 4, 6, 8, and 10 are examples of even numbers. Notice that they are all doubles.
Which of the following sums has an answer that is an even number?
Ethan has drawn this picture to show that 16 is an even number.
His teacher asks him to complete the addition sentence that shows that 16 is even.
He knows that he needs to write the same number in both boxes. What number is this?