Suppose a number, multiple of 10 between 10 and 90, is entered in cell A1. Your task is to set up a lookup table so that cell D1 displays in words...

Suppose a number, multiple of 10 between 10 and 90, is entered in cell A1. Your task is to set up a lookup table so that cell D1 displays in words the number entered in cell A1. For example, when number 10 is entered in cell A1, D1 displays "Ten" and it displays "Twenty" when 20 is entered in cell A1. Make sure to add data validation for cell A1 to flag invalid entries.