By using this site, you are accepting "session" cookies, as set out in the site's Privacy Policy
Cookies are also used to remember which page of the book you last viewed, so that when you revisit the site you automatically return to the last page you visited.
It is true that the expression you have chosen could be written as a decimal number. However, this expression is not the expanded form of a decimal number because the powers of ten are not arranged in descending order from left to right. If we write the coefficients of the expression in the order that they appear, we get 3,426. But if you find the sum of the above expressions you’ll find it is not 3,426; it is 60,423.