0.045 to 0.054 -- ten of them.
It is not always the same. In many countries, the smallest unit of money is 0.01 (hundredth), so money is almost always rounded to two decimals. But this may vary from country to country. Some may use more or less decimals - or not use decimals at all.
There are infinitely many of them. 0.3011, 0.30111, 0.3011111111, 0.30151 are 4 examples.
All of them from 0.0450 to 0.0549 . That's 99 of them, but I think 98 is a better answer, because 0.0500 wouldn't need to be rounded at all.
800
0.05
That depends how many decimals you want to keep.
6.5 or 6.50 depending on how many decimals you need to show.
6 decimal place
800
You go backwards in decimals three times. Answer = 300 milligrams.
There are infinitely many numbers. Three examples are: 3.0000000000000012300045973 3.00000000000000123000459746009 4.999999999999999999999999
The three numbers between 0.3 and0.4 are 0.31,0.32,0.33. But there are many more between those decimals.
There are 99 of them - using the IEEE standard of rounding half to even
There are no decimals in 12000 * * * * * 12000 sq ft = 27.55 decimals.
10 decimetres = 1 metre so just 1 decimal place.
99 of them.