645 is a 3-digit number. A single digit in a number can have a place value. A number with several digits cannot.
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Ignore the digit in the ones position.If the digit in the tens position is 5 or greater, then raise the digit in the hundreds position. If not, then leave the digit in the hundreds position the same.Drop all digits that aren't in the hundreds position by making them 0's.The answer is: 500
0.0233
In the particular position, it is 70,000.
Proceed from left to right, using the largest possible digit in each position.
From left to right, choose the smallest digit for each position. Thus, the first digit would be 1, the second digit 0, the third digit 2, etc.