Welcome to the 30 Day Challenge for July, where we’ll be looking at the STEM fields: Science, Technology, Engineering, and Math. I originally conceived of the as the Science & Math Challenge so those two categories will get more attention, but we will touch on all of them.

Today we want to know about tricks, shortcuts, and mnemonics that have helped you with science and math concepts. Which ones did you learn in school? Did they work for you? What are your favorites? Have you invented any yourself?

Don’t forget the tricks and shortcuts part. If there’s a math problem solving hack you love or an algorithm you think is better than the standard one, please share. If it’s something that’s hard to explain in words, feel free to embed a video or link to a relevant resource.