The currency in Egypt is exclusively the Egyptian Pound
The exchange rate today is around : US $1 = 17.61 Pounds
It is important to note that you can only use Egyptian Pounds in Egypt.
Please make sure that you and your students bring Egyptian Pounds before departing for Egypt. Stores will not accept US Dollars or any other currency
There are ATMs in Egypt that dispense Pounds and they will probably offer good exchange rates.
There is a bank that is close to the school that can exchange US Dollars or Euros to Egyptian Pounds. Do not bring your local currency but only US Dollars or Euros. Bank will not exchange any other currency.