Calculator of the past  

Do you ever wonder what calculators back Then? We'll today we are going to do that.I think this was invented because if you did't know a math problem you would need someone or something to tell you the answer.This object has changed because back then people did not have many materials.This object affect people's because knowledge is very import so people would need a calculator.This is going to affect people's life because people might invent a new math-symbol and then people need it then.And people might make it where you just have of the number and it will do the tipping for you.