It is the leading digit.
It is the first or leftmost digit: 4.
When rounding 5555 to 2 significant figures, we start counting from the leftmost non-zero digit. In this case, the leftmost non-zero digit is 5. The next digit after 5 is 5, which is greater than or equal to 5, so we round up the leftmost non-zero digit. Therefore, 5555 rounded to 2 significant figures is 5600.
0.2.
It is 5000000.
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.
When rounding 5555 to 2 significant figures, we start counting from the leftmost non-zero digit. In this case, the leftmost non-zero digit is 5. The next digit after 5 is 5, which is greater than or equal to 5, so we round up the leftmost non-zero digit. Therefore, 5555 rounded to 2 significant figures is 5600.
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.