If a measurement is recorded as 0.007890, how many significant figures does it h

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Question: If a measurement is recorded as 0.007890, how many significant figures does it have?

Options:

Correct Answer: 5

Solution:

Leading zeros do not count as significant figures. The significant figures in 0.007890 are 7, 8, 9, and 0, which totals to 4 significant figures.

If a measurement is recorded as 0.007890, how many significant figures does it have?

If a measurement is recorded as 0.007890, how many significant figures does it have?

Step 1: Identify the number given, which is 0.007890.
Step 2: Look at the leading zeros (the zeros before the first non-zero digit). These are 0.00, and they do not count as significant figures.
Step 3: Find the first non-zero digit, which is 7. This is the start of the significant figures.
Step 4: Count all the digits from the first non-zero digit onward, including any zeros that come after non-zero digits.
Step 5: The digits to count are 7, 8, 9, and the last 0. So, we have 7, 8, 9, and 0.
Step 6: Count these digits: 7 (1), 8 (2), 9 (3), and 0 (4). This gives us a total of 4 significant figures.

Significant Figures – Understanding how to identify significant figures in a number, including the treatment of leading zeros.