Australian 1 and 2 cent coins are still legal tender, but you may have a lot of trouble convincing a shopkeeper of that.
You should be able to take them to a bank at which you are a customer and have them exchanged for the equivalent value in current coins.
You might like to keep a few for your grandkids.
May I just add that some charities are pleased to receive coins of any country, to sell on to dealers and raise some money. Worth going to local charity shops and checking.
All coins are of different size and appearance so that they can be told apart visually and by feel.
There were 4,337,200 Australian 1997 50 cent coins minted.
Such a coin does not exist. The Australian "cent" coins were first introduced in 1966.
Australian 1 cent coins are no longer in circulation, but unless they are part of a proof set or are in mint condition, they are worth 1 cent.
The Australian 2 cent coin was introduced at the changeover to decimal currency in 1966. There were no Australian "cent" coins minted prior to 1966.
An Australian Twenty cent coin weighs 11.31 grams, so there would be about 88 Twenty cent coins in a Kilogram.
There are 100 cents in the Australian Dollar. That can constitute - 20 x 5 cent coins. 10 x 10 cent coins. 5 x 20 cent coins. 2 x 50 cent coins. 1 x 1 Dollar coin. The 1 and 2 cent coins are no longer in circulation.
The Royal Australian Mint produced 19.031 million standard cupro-nickel 50 cent coins.
Presumably, you refer to the Australian 50 cent coin. The round Australian 50 cent coin was only ever minted for 1966. All subsequent Australian 50 cent coins are dodecagonal or 12 sided.
An Australian 2001 50 cent coin roll, in the original Mint wrapper, uncirculated and in absolute mint condition could fetch up to $70 AUD. Coin rolls for all nine coins issued for this theme have the same value. A reputable coin dealer will be able to give a more accurate valuation.
An Australian 5 cent coin weighs 2.83 grams. Figure it out.
Such a coin does not exist. The first Australian 20 cent coins were issued in 1966.