0.0510, although this is equivalent to 0.51 or fiftyone thousandths.
905000
That is the correct spelling (eight hundred thousandths) for the numeral 0.800 or the fraction 800/1000.
Six hundred ninety-four ten thousandths can not be written as a numeral, but it can be written as the decimal 0.0694.
Either 400.006 or 0.406, depending on how you meant it.
100/5000 = 200/10000 = .02 9 and 100/5000 = 9.02
79 hundred-thousandths = 0.00079
0.00507 is 507 hundred thousandths.
Six and two hundred thousandths
Five hundred three and one hundred two thousandths
If it is grouped as "seven (hundred thousandths)", the answer is 0.00007. If it is "(seven hundred) thousandths", it's 0.7.
200.005 is two hundred and five thousandths.