Depending on how that is punctuated, it could be one of the following:
8 304/1000000
8 300/4000000
Eight hundred thousand forty-two millionths = 0.800042
Eight hundred millionths.
9,355,728,100,015,000,000,000
To write eight hundred thousand and forty-two millionths in standard form, you would use the decimal form. It would be written as 0.800042.
0.000623
Eight and three hundred four millionths in standard notation is 8.000304
Eight hundred thousand forty-two millionths = 0.800042
Three hundred ninety-six millionths = 0.000396
It is 9.593 438
Fifty-eight million, seven hundred thirteen thousand, three hundred thirteen hundred-millionths.
Two hundred fifty-nine and seven hundred fifty thousand, three hundred eighty-eight millionths.
.00000003
19.678923 = Nineteen and six hundred seventy-eight thousand nine hundred twenty-three millionths.
Three and seven hundred thirty-two millionths = 3.000732
Eight hundred millionths.
Sixty-seven and three hundred twenty-four thousand eight hundred seventy-four millionths.
One thousand, eight hundred seventy-five millionths.