Nineteen.
Nineteen thousand.
Nineteen hundredths.
You could write it as 38/10 or 19/5 cm.You could write it as 38/10 or 19/5 cm.You could write it as 38/10 or 19/5 cm.You could write it as 38/10 or 19/5 cm.
19 = 19.0
nineteen hundredths
19% = 0.19
190%
nineteen billion six hundred million eight hundred thousand four
Under today's rules 19 in Roman numerals are considered to be XIX but the Romans themselves would have probably calculated 19 as XVIIII and then simplified it to IXX (-1+20=19) in fact the Latin word for 19 literally means one from twenty.
19 hundredths written as a percentage is 19%
19% 19/100
19 = 1.9 × 101