How many key words in subtraction?

It's tricky to say there's a specific number of "keywords" for subtraction, as the language used can vary a lot. However, here are some common words and phrases that indicate subtraction:

Basic Keywords:

* Subtract

* Minus

* Less

* Take away

* Difference

Phrases indicating subtraction:

* How much less than...

* How much is left?

* What is the difference between...?

* Decrease by...

* Reduce by...

* Subtract...from...

Examples:

* "Subtract 5 from 10."

* "What is the difference between 12 and 7?"

* "Reduce 20 by 8."

It's important to understand the context of the problem to correctly identify the operation being used.

Let me know if you have any other questions!