The 4 is in the 5th column to the left of the decimal point (which is "hiding" after the ones digit) so it is in the 10000 column, the ten thousands column; the 4 represents 4 × 10,000 = 40,000 which is forty thousand.
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A digit within a number has a place value, not the entire number - such as 3.94.
In the number 432, the digit 3 holds a place value of 30, as it is in the tens place. This means that the value of the digit 3 is 30. Each digit in a number represents a different place value based on its position within the number, with the rightmost digit representing ones, the next digit to the left representing tens, and so on.
The places are always the same no matter what the digits are. The value is obtained by multiplying the place times the digit. Starting from the right, the places in an 8-digit number are ones, tens, hundreds, thousands, ten thousands, hundred thousands, millions and ten millions.
A single digit in a number can have a place value. A number with several digits cannot.
It is expressing a number in decimal form: that is, a form in which the place value of each digit is one tenth the place value of the digit to its left.