Two hundred and twelve dollars in figures is $212.
Five hundred twelve and 50/100 dollars
You don't because that is not an actual number. You might write twelve hundred dollars, as I just did, or in numbers $1200.
Twelve thousand five hundred dollars = $12,500
12 thousand + 12 hundred + 12 = 13,212
Two hundred and twelve dollars in figures is $212.
Five hundred twelve and 50/100 dollars
$12250
Eight hundred and twelve dollars (and no/100 or 00/100 if on a check)
Eleven thousand two hundred and 00/100 dollars
2,812,852$
You don't because that is not an actual number. You might write twelve hundred dollars, as I just did, or in numbers $1200.
Twelve thousand five hundred dollars = $12,500
Seventeen thousand three hundred twelve and 00/100 dollars
One million one hundred twelve thousand one hundred thirteen and 86/100 dollars
Twelve thousand three hundred thirty-two and 69/100 dollars
Six hundred twelve.