Notice how Filipinos use the Spanish currency "pesos" instead of "piso?"
You'll be surprised how often you'll hear Filipinos use these numbers especially when in the market, when you buy from the store, or when paying the fare for a dyip or tricycle ride. It is a habit of the Filipinos to use English, Filipino, and Spanish Loaned numbers alternately, when involving money.
Person 1: How much is the fare going to the market?
Person 2: 8 pesos.
Person 1: Magkano ang papuntang palengke?
Person 2: Otso pesos.
Filipinos do not normally say siyento for hundreds. It would sound odd if you do! They simply say "-hundred" or "-daan". For example: One hundred pesos, isáng daán, or sandaán.
Again, there are no exact rules in using these Spanish loaned numbers. Traditionally, Filipinos use these in certain situations as stated earlier. It is best to familiarize yourself with these numerals so you will not get confused when the person you are talking with uses Filipino and Spanish Loaned numbers alternately.