'Silver' in the Bible

"A certain creditor had two debtors; one owed him five hundred silver coins, and the other fifty.

The next day he took out two silver coins and gave them to the innkeeper, saying, 'Take care of him, and whatever else you spend, I will repay you when I come back this way.'

"Or what woman, if she has ten silver coins and loses one of them, does not light a lamp, sweep the house, and search thoroughly until she finds it?