Correction Day: How a Nigerian Maths Teacher Turns Mistakes Into Lessons

Last week we worked through circles, and I made sure to take it one step at a time. First the definition, then perimeter (circumference, same thing, I always tell them), and finally area.

I didn't rush any of it because area never makes sense if radius and diameter haven't properly sunk in first. Each lesson was really just laying the ground for the next one.

Friday, I gave them homework on area of a circle alone. Partly so they'd practice, but honestly, also so I could see who actually got it and who was just going through the motions in class, nodding because everyone else was nodding.

This morning was correction. And like every correction session, it had its surprises. Quite a few pupils substituted correctly and landed on the right answer, no issues.

But as soon as a question gave the diameter instead of the radius, things fell apart a bit. Some forgot to halve it before squaring. Others just squared the diameter straight up and couldn't figure out why their number came out way too big.

I kept seeing the same mistake show up script after script, so instead of just ticking and crossing and moving on, I stopped to deal with it properly.
Back to the board we went. I redid the tricky questions slowly, right at the point where the diameter-to-radius step gets missed. You could see it on a few faces, that little "ohhh" moment when something finally clicks.

By the end, most of them could handle area of a circle comfortably, diameter trap included. I always remind myself correction isn't about punishing wrong answers, it's where today's mistakes quietly become tomorrow's stronger lesson.