None, there are no disadvantages.
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The decimal system is based on 10 and the powers of 10. The main disadvantage is that 10 is divisible by only 2 and 5. So commonly needed fractions, such as a third end up being infinite decimals.
6.7,6.8,6.4,5.9
Terminating decimals are decimals that end, such as, 2.384. Non-terminating decimals that don't end, such as, 0.3333333333.......
3rd. Adding Decimals 5th - Adding and subtracting 6th - Dividing Decimals
You can use decimals in money.