sentence: Humans have a problem with math.
sentences_after: To show this, try doing 584 x 3,220 in your head. People made tools to help them remember where they were in a math problem. The other problem people have is that they have to do the same problem over and over and over again. A cashier used to make change every day in her head or with a piece of paper. That took a lot of time and people made mistakes.
concept_name: human
headings: Computer History of computers Automation
categories: Tools