When saying the number, the
53 in the first category,
it is said fifty-three then the category name:
fifty-three billion
The next 3 digits, 794 is
said the way it looks then with the
category name afterwards:
seven hundred
ninety-four million
Next is the 320 followed by
the category name:
Three hundred twenty
thousand
Followed by the number 642,
since the category is "ones" it is not said:
Six hundred forty-two
Notice that the word "and"
does not appear until you get to the decimal
In the decimal category the
number is said as it looks
followed by the place value of the last digit:
Five hundred eighty-one
thousandths
