Write nine billion, two hundred forty-six million, seventy-three thousand, one hundred eighty-nine using digits.

1. Identify the words that mark each period: billions, millions, thousands, and ones. 2. Draw three blanks for every period except the first, since only the leading period can have fewer than three digits. 3. Fill in nine for the billions period, two hundred forty-six for the millions period, seventy-three for the thousands period, and one hundred eighty-nine for the ones period. 4. Combine the periods with commas to get 9,246,073,189. 5. Swapping any two digits between periods, such as putting 264 in the millions period, gives a different number than the one named. _Source: OpenStax Elementary Algebra (CC BY 4.0), Ch 1 "Foundations", section 1.1 Introduction to Whole Numbers_