Divisibility Tricks with Modular Arithmetic

Hi everyone!

In this video we look at proving a trick to know whether a number is divisible by 3 (no matter how large). The proof is surprisingly simple, and we use some modular arithmetic where numbers 'loop back' to zero at a certain point (just like the time of day).

If you're interested in modular arithmetic, you can check out these pages:

💡Suggestion Box💡

LearnaLotl is all about sharing a love of learning. If you’d like to support this effort, please consider giving us a like and subscribe and feel free to drop a comment below!