I think you're asking about powers of ten, not multiples of ten. In whole numbers, the place values as they increase from right to left are: ones, tens, hundreds, thousands, ten-thousands, hundred thousands, millions, ten-millions, hundred millions, billions, ten-billions, hundred billions, trillions...
Each place value increases by another power of ten:
Place Value Power of ten
ones 10 to the zero power
tens 10 to the first power
hundreds 10 to the 2nd power (10 squared)
thousands 10 to the 3rd power (10 cubed)
ten-thousands 10 to the 4th power
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The definition of Expanded form is a way of breaking up a number to show how much each digit in the number represents. In a way this is like pulling apart a number and expressing it as a sum of the value of each digit.
Computers do much of their processing in binary. Hexadecimal is used as a kind of shortcut (easier to read for humans): each hexadecimal digit represents four binary digits.
1k represents 1,000, 2k represents 2,000, and so on.
It determines how much that digit is worth. See this article on place value. http://www.aaamath.com/plc.htm
yes.0 is a digit because if 0 is in 10,why wouldn`t 0 be a digit.