Explanation:
The number before the "and" or the comma is the integer portion of the number. The decimal fraction portion follows. "Tenths", or "hundredths", or "thousandths" tells you the denominator, hence the location of the rightmost digit. Otherwise the fraction digits are represented normally. ("two hundred seventy-eight" is still 278, for example.)
a. six and two tenths: 6.2
b. seventeen and four hundredths: 17.04
c. four hundred, and thirty-five thousandths: 400.035
d. fifty-six, and two hundred seventy-eight thousandth: 56.278
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"thirty-five thousandths" can be written as 35/1000 or 0.035. Both are pronounced the same and mean the same thing.
