Information is nearly instantaneous nowadays. Instead of needing to remember things, it has grown far more important for us to be able to search information systems like the web in order to find the things that we are looking for.
Rather than memorizing baseball stats for the last 100 years or world capitals, it is far more effective and efficient to know how to find that information online. While we could train ourselves to learn systems of complex math in our head, it’s easier and more accurate to just use a calculator.