100 coins are plural (Meaning that there is more than one), so yes, it is pronounced "coins".
Depends on if you are talking about probability. If so then yes. If not then 100 coins is more than 1 coin.
What the forum FAQ says about floating coins: Q: Coin Fountain: I see flying coins! What does that mean? A: The coins are a random chance for players to win 100 coins while plowing, planting or harvesting. It happens completely randomly with any kind of crop. If you see the coin above your head, check your coin balance. You should have an additional 100 coins in there. You do not need to click on the coin or grab it, the addition of the coins will be added automatically.
you get 100 coins when you find a gold coin plowing
You get 1 gold by collecting 100 silver coins, and you get 1 silver coin by getting 100 bronze coins.
The US Mint did not make any 100 dollar coins in 1959.
The US Mint never struck any 100 dollar coins for circulation, only Platinum Bullion coins have a 100 dollar denomination.
When you find a coin via plowing your own plots you have gained 100 coins.
depends on the originality and quality of the coins
The only way I know you can do this is by using the following Action Replay code: 0209f358 00000064 It is actually called 'Get 99 coins' but when you go into a level you will find you always have exactly 100 coins to start with. When you get another coin, as the values do not increase (unfortunately) or decrease, that you have got the 100th coin, so the 100 coin star appears. Result!
The probability is always 50/50 even if you flipped 100 or 1000000 coins.
You don't. You don't EVER clean a gold coin and you don't clean a silver coin. Cleaning ruins the value of coins! If it has any collector value at all it will be demolished by a cleaning. Cleaning can take a $100 coin into a $10 coin. It will never, ever improve the value of the coin unless you literally dug it out of the ground. Do not clean coins.
Collect 100 coins in that mission