Two in many countries: 0.25 and 0.10.
Originally coins were different sizes because their values were determined by how much metal they contained. For example, a US dime had roughly 10 cents worth of silver in it, a British sovereign had roughly a pound's worth of gold, etc. People could associate a coin's value with its size, making it easy to tell them apart. Even though circulating coins today don't have any precious metals in them, different sizes still help people to easily distinguish one coin from another without looking at its design or denomination. Having different sizes also facilitates the use of mechanical sorting equipment. Mixed coins are passed through a kind of filter with holes of increasing sizes. The smallest coins drop through the smallest holes first, the next size coins drop through the second set of holes, and so on, and are collected in bins.
There are many countries which use cents as their minor currency units and these coins are not all the same size. With no information as to which county's coins the question is about, it is impossible to give an answer.
Many countries use 25 cent coins and they are not the same size. Since you have not specified which county's currency you are asking about, I cannot provide a more useful answer.
Assuming that you are referring to US coins, it does not seem to be possible, even if obsolete denominations are allowed, to use five different denominations of coins to make exactly 50 cents. I am not aware of any other countries that use "cents" that would allow you to do so either. However, in Czarist Russia, and in the Soviet Union, there were coins in the denominations (among others) of 2, 3, 10, 15 and 20 kopeks, the total of which 5 coins would be 50 kopeks.
Nearly every country uses coins for small currency amounts. At this writing (2016) only Belarus and Laos don't use coins, mostly because their currencies are so devalued that coins cost more to make than they are worth.
The practice of putting holes, specifically square holes, in currency originated in China. Holes were typically placed in 方孔錢 (fang kong qian) or cash, as it is refereed to in English, before China started using the recognizable round coin shape. Instead, cash was in the shape of a knife or a small spade prior to the use of round coins. The first known use of square holes in round cash as been dated to as early as 378 BCE. Since many countries in East Asia adopted Chinese currency systems because for their presence in the Chinese cultural sphere, these countries likewise used square-holed coins for at least some of their currency usage. These include Japan, Korea, and Vietnam. Some other countries, such as Brunei, were known to use Chinese currency before establishing their own systems. That being said, most of Southeast Asia either developed their own early currency systems or did not have a currency prior to European exposure, relying on barter.
No country uses gold for circulation coins because the metal's price changes every day. It would be impossible to mint a coin and have it be worth a specific amount of money.
Lydians have invented coins, in which we still use today. In fact, they were the first to mint(make) coins.
Lydians have invented coins, in which we still use today. In fact, they were the first to mint(make) coins.
The name beside a harp on euro coins is ÉIRE. That is the Irish name for Ireland, and the coins with it on it are Euro coins from Ireland. They are accepted in any of the countries that use the Euro. Other countries would have different symbols and words on their Euro coins.
no
Many dozens of countries use nickel in their coins. Please post a new and more specific question with the name(s) of the country or countries you're interested in.
IF you are fortunate enough to be in one of the countries that used to use the particular denomination, some large banks may still exchange them for euros (note - not " euro's ") However you may or may not take a beating on the exchange rate because there is no use for these old coins.
The first British coins were minted well over 1,000 years ago. The only denomination from that time that is still in use is the penny, but it is a much different coin now than it was then.
The Euro is the same for all countries that use it, though one side of the coin is different in each country. All the notes are the same for all countries. You can still use those different coins in any of the countries that use the Euro. Not all countries in Europe use the Euro. There are over 50 countries in Europe. 28 of them are members of an organisation called the European Union. 18 of those 28 countries use the Euro as their currency.
yes 5 pound coins are legal tender