Simplify the following text for a Grade 12 native English-speaking person.
Original: When invoking , the end-parameter can be a number to designate the level of rounding , such as `` 0 '' for whole numbers , `` 1 '' for 1 decimal ( tenths ) , `` 2 '' for 2 decimals , '' -2 '' for whole hundreds 100 's , etc. .
Simplified: When invoking , the end-parameter can be a number to designate the level of rounding , such as `` 0 '' for whole numbers , `` 1 '' for 1 decimal , `` 2 '' for 2 decimals , '' -2 '' for whole hundreds , etc. .