In the number 102568, the 1 is the leftmost non-zero digit.
In the number 0.0004583, the 4 is the leftmost non-zero digit.
It is the leading digit.
It is the first or leftmost digit: 4.
0.2.
It is 5000000.
You can do this by taking the 9-digit complement of the number 100000, adding it to the number 164502423, removing the leftmost digit from the result, and adding it to the number: 164502423 -100000 take the complement and add it: 164502423 +999899999 = 1164402422 remove the leftmost digit and add it to the rightmost one: 164402422 + 1 = 164402423 and there you have it.
It is the leading digit.
It is the first or leftmost digit: 4.
Five. Count from the first nonzero digit to the last nonzero digit.
The most significant digit.
To round off 128,674 to leave one nonzero digit, you would round it to 100,000.
There is no digit in the thousands place. There is an 8 in the thousandths place.
0.2.
It is 400.
4 Every digit between the leftmost non-zero digit and EITHER the right most non-zero digit OR the rightmost digit after a decimal.
It is 300000.
It is 6000000.
It is 300.