The expression "1 + 1 + 2" represents a simple arithmetic operation involving addition. In this case, you start with the number 1, add another 1, and then add 2. The process of addition combines these numbers to find a total. When you calculate "1 + 1 + 2," you first add the two 1s together, which equals 2. Then, you add this result to the 2 in the expression. The final result is 4, demonstrating how basic addition works with whole numbers.