We didn't have computers when I was in high school. We used slide rules. I used to know how to use one. No doubt not that well though. :O)
I remember seeing my second computer in the computer lab at high school. It had a plated wire memory. My first one was a large computer about the size of a small shed with 32K of physical memory. I did learn to use a slide rule and used it in college physics. Still have them and occasionally show them to students I tutor in high school math. I tell them it is a computer.