I don't think the author meant that people aren't walking calculators. I believe he implies that people don't want to understand how to evaluate a math problem.

I don't think the author meant that people aren't walking calculators. I believe he implies that people don't want to understand how to evaluate a math problem. Most people that "can do" math still use a calculator; additionally, they understand what's happening and they can identify an answer that is absurd (because of a key-press mistake).