Well, you're in luck. It's time to brush off the cobwebs from that part of your brain and finally draw out the knowledge that hasn't had a chance to resurface since your GCSE's.
Get ready for the teenage flashback, sat at your desk with the single pen you own (you were either the person who borrowed one every day, or the one that lost all of yours handing them out to people who asked to borrow them), staring blankly at the many, many questions left to fill out, listening to all the people around you obnoxiously flipping their pages as loud as they can.
Yeah, that was fun.
Anyway! Put yourself to the test and see whether you can answer all of these questions correctly, proving yourself to be the brightest of the bright:
So, how did you do?
Did you have to use a calculator, or grab a pen and paper?
It's actually quite surprising how we remember the most random equations we haven't even thought about in years - and be honest, once you did work it out, you got that little feeling of triumph bubble up in your chest.
Once in a while it's nice to know that you've still got it, and there is some hope for when the kids come home asking for help with their homework!