One hundred twelve over two hundred twenty (112/220) calculates into simplest form as twenty-eight over fifty-five (28/55 or 0.509090909 repeating).
If you want all the numbers added, it's 13212. If not, then it is impossible to write or type twelve thousand twelve hundred twelve in simplest form.
3/25
6/13
Twenty and one hundred twelve thousandths.
Four hundred twenty-four thousand, six hundred twelve.
twelve billion, three hundred twenty million, one hundred twenty thousand.
12/20 = 3/5
three billion, nine hundred twenty-five million, twelve thousand, three hundred twenty-nine and twenty-four hundredths.
Twelve and twenty-five hundredths.
21 percent or twenty-one out of one hundred is already in simplest form. Twenty-one and one hundred have no common factors (excepting 1).
12.628
twelve point four hundred twenty five