I suspect the answer is 20000 but the wording of the question makes it is difficult to be sure.
2100
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.
600 same as rounding to 1 significant figure
No, 6. You count from the first non-zero digit to the last non-zero digit. Zeros between non-zero digits are counted.
When rounding to 1 significant figure, we look at the first non-zero digit from the left. In this case, the first non-zero digit is 6. Since the digit immediately following it is less than 5, we round down. Therefore, 0.006772 rounded to 1 significant figure is 0.006.
2100
129,000
Round it to the nearest thousand, which is 7,000 .
Round to whatever non-zero digit is farthest to the left.
It is 5000000.
Round it to the nearest ten thousands: 90000
Round to the nearest million and get 6 000 000
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.
600 same as rounding to 1 significant figure
A significant digit is generally considered to be any non-zero digit, as well as zeros that are between non-zero digits or to the right of a decimal point after a non-zero digit. Zeros to the left of the first non-zero digit are not significant. Therefore, when considering significant digits, the position of the digit (left or right) matters, especially in relation to decimal points and the presence of non-zero digits.
4 Every digit between the leftmost non-zero digit and EITHER the right most non-zero digit OR the rightmost digit after a decimal.
No, 6. You count from the first non-zero digit to the last non-zero digit. Zeros between non-zero digits are counted.