Concept: A calculator can help us figure out math problems, but some things cannot be figured out. We believe them even though we don't understand them or have the answers.

Preparation: A hand-held calculator.

Have you ever used a calculator? You punch in a problem and the calculator figures the answer for you. Kind of neat, huh? Let's give it a try. 23 + 12. (Put in the problem.) Boom, the calculator says that 23 + 12 = 35. How about 103 - 22? (Put in the problem.) The calculator says 103 - 22 = 81. Someone give me a problem. (Choose a volunteer. Make sure the problem is reasonable. Put in the problem.) Here's your answer. Calculators make it simple to get the right answer every time. We don't have to do any work and we don't hav…