In the problem four and seventy-two hundredths, four is a whole number. "Hundreths" is misspelled and should be hundredths. The best way to think of 72 hundredths is as a combination of tenths hundredths, rather than hundredths and hundredths. 10 hundredths is a tenth, so 72 hundredths would be 7 tenths and 2 hundredths (for decimal places, the names go left to write - tenths, hundredths, thousandths, etc). The final number, written as a decimal, would therefore be 4.72. If written as a mixed number (a whole number and a fraction) it would be 4 72/100.
