A. \( 90-70 \) B. \( 400+400 \) C. \( 2+6 \)

Let's dive into some fun facts about these simple arithmetic operations! The first operation, \( 90 - 70 \), is a classic example of subtraction that shows how taking away can yield a straightforward result of \( 20 \), emphasizing how we can trim down numbers to achieve clarity. Then we have \( 400 + 400 \), which not only results in \( 800 \) but also illustrates the beauty of addition in everyday contexts like combining resources or tallying scores—just think of how satisfying it feels to double your score in a game!