5 ten thousandths in decimal form is 0.0005 Any decimal number that has three zeros after the decimal point and then a lower number than 5 is smaller. If the number has more than three zeros after the decimal point it is smaller.
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0.00001
0.0004
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.
0.00045 ten-thousandths is 0.0005. You can write any number which has 4 or less in place of the 5, and any numbers you want after that. Another example would be 0.000357915.
0.0004