Subtraction

Subtraction is a mathematical operation to determine the remaining quantity when some amount is taken away. For example, if you have a pack of six beers, and consume two, you are left with four beers.

Negative numbers
Negative numbers do not exist. If you ever see a problem similar to "If Johnny has 5 apples and you take away 8 of them, how many are left?", you've been asked a trick question as part of conservative deceit.