>>11576220With all the tools and software available, doing concrete examples is easier than it was previously.
But you still need to know what will happen when you put the numbers in, otherwise, how do you know your answer is correct? Solving it on paper with a concrete example lowers the chance for errors that aren't your fault.
Having an understanding of the numbers that are commonly seen in various equations and being able to do operations for those numbers in your head, grants a strong intuition.
