### Home > AC > Chapter 5 > Lesson 5.2.2 > Problem 5-81

5-81.

Even numbers are closed under addition, because the sum of two even numbers is also even.

For example,

4 + 4 = 8

10 + 10 = 20

36 + 36 = 72

What happens if you mulitply two even numbers together?

For example,

(4)(4) = 16

(10)(10) = 100

(36)(36) = 1296