How many significant figures does the number 80.004500 contain?

The number 80.004500 contains 8 significant figures. When determining significant figures, several rules apply:

1. Non-zero digits are always significant: In this case, 8, 0, 0, 4, 5, and the last two zeros after the decimal are non-zero or follow designated significant figures.

2. Any zeros between significant digits are also considered significant: The zeros between the 8 and the 4 (as well as between 4 and 5) count as significant figures.

3. Trailing zeros in a decimal number are significant: Therefore, the two zeros following the 5 in the decimal portion (80.004500) are also counted as significant figures.

Taking all of this into account, the digits in 80.004500 break down as follows: 8 (1), 0 (2), 0 (3), 4 (4), 5 (5), 0 (6), 0 (7), which leads to a total of 8 significant figures. This includes all the digits in the number, as they all contribute to its precision.