What is another word for subtraction?

There are several synonyms for subtraction, depending on the context:

Formal:

* Minus

* Deduct

* Take away

* Decrease

* Diminish

* Reduce

Informal:

* Subtract (this is the most common and straightforward synonym)

* Take off

* Remove

* Cut back

The best synonym to use will depend on the specific situation and the desired tone.