First you must decide what is a "suitable degree of accuracy" for a particular problem. In many cases, 4 or 5 significant digits are appropriate, or even 3. But it depends a lot on the original data (the final result is not supposed to look more accurate than the accuracy you can justify from the original data), and the purpose of the data (in some cases you need a higher accuracy than in others).
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10000 or 10000. Although it may also be written as 10000.0, the second version implies a greater degree of accuracy.
You write it as 12, exactly as in the question.A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point. Adding zeros after the decimal point is wrong because they imply a degree of accuracy (significant figures) for which there is no justification.
Usually, one can only write with either the Left or Right hand. People with dexterous hand can write with the same accuracy with both hands.
You would write it as 9000 - nothing more, nor less. A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point. Adding zeros after the decimal point is wrong because they imply a degree of accuracy (significant figures) for which there is no justification.
10500 is good. You could try 10500. or 10500.0 but the latter implies a level of accuracy that may not be justified.