The official currency of Mexico used in Cancun is the MEXICAN PESO. It is also referred as “M.N.” that stands for “Moneda Nacional” (National Currency).
I have seen the exchange rate go from 9.5 to 14.5 pesos to 1 US Dollar, however for easy and quick figuring, just think 10 to 1. $10 US Dollars is about $100 pesos, the orangish bill below. Or some people like to convert the other way…say something costs 200 pesos…think, that is only $20 dollars!
Bills: $20, $50, $100, $200, $500 and $1000. $20 and $50 pesos bills are made of polymer (plastic fiber). $100, $200, $500 and $1000 pesos are printed on high security cotton paper.
Commemorative $100 and $200 pesos bills. Limited edition. In circulation since September 2009. $100 pesos made of polymer (plastic fiber) and $200 printed on security paper.
Coin values: 10¢, 20¢, 50¢, $1, $2, $5 and $10
Prices in Mexican Pesos are posted with only the peso sign ($) in front, some businesses use MX$5.00, MN$5.00 or $5.00MN to make more clear for foreigners; for prices in U.S. Dollars usually as US$5.00, $5.00US or $5.00USD. Coin values: 10¢, 20¢, 50¢, $1, $2, $5 and $10 There are hardly any 10¢ and 20¢ coins in circulation in our destination. For payment purposes, if the amount is less than 25¢ the lowest unit will be charged; if it is between 25¢ and 75¢ the charge will be 50¢; if it is above 75¢ it will go to the next high unit (e.g.: $9.20 will be charged as $9.00; $9.35 as $9.50; $9.60 as $9.50; $9.80 as $10.00). Some businesses may not abide by this rule and they will charge you to the half unit or next high unit (e.g.: $9.20 will be charged as $9.50; $9.60 as $10.00). $20 pesos coin is not longer in circulation and can’t be used (not legal tender).