Holy cow ! That's a big number. Here we go:
"Eight hundred forty-three billion, two hundred eight million, seven hundred thirty-two thousand, eight hundred thirty-three."
Notice that the whole thing doesn't have any "and" in it.
The word form for the number 843,208,732,833 is "Eight hundred forty-three billion, two hundred eight million, seven hundred thirty-two thousand, eight hundred thirty-three." Each segment of the number is read according to its place value, combining them for a complete expression.
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[tex]13 - 3.5 + \frac{1}{2} \times 6 \\ \\ = 13 - 3.5 + 3 \\ = 9.5 + 3 \\ = 12.5[/tex]