To write a number in words, write the number in each period, followed by the name of the period, without the s at the end. The commas separate the periods, so wherever there is a comma in the number, ...To write a number in words, write the number in each period, followed by the name of the period, without the s at the end. The commas separate the periods, so wherever there is a comma in the number, put a comma between the words (see Figure \PageIndex3). It is helpful to draw three blanks for the needed periods and then fill in the blanks with the numbers, separating the periods with commas. The prime factorization of a number is the product of prime numbers that equals the number.
