Definitions from a mathematical mouse

subtraction:  the process of taking away one number/amount from another number/amount, which finds the difference between them.

My Youtube videos below demonstrate how to understand formal methods for subtraction. Hope you enjoy them and watch them as many times as you need until you become really confident that you fully understand them!

Of course, you as a great mathematician already know that sometimes using mental methods can be the best strategy and sometimes using formal methods is the best method. Don't always use the same approach - use the best approach!

TdM Brie-Anna de Mouse, creator and star of Maths with a Mouse