How many significant figures are in the number 0.007890?

How many significant figures are in the number 0.007890?

Step 1: Identify the non-zero digits in the number 0.007890. These are 7, 8, and 9.
Step 2: Count the non-zero digits. There are 3 non-zero digits: 7, 8, and 9.
Step 3: Look at the zeros in front of the number (0.007890). These leading zeros do not count as significant figures.
Step 4: Check for any trailing zeros after the last non-zero digit (which is 0 in this case). The trailing zero counts as a significant figure.
Step 5: Add the non-zero digits and the trailing zero together. This gives us 3 (from 7, 8, and 9) + 1 (from the trailing zero) = 4 significant figures.

Significant Figures – Significant figures are the digits in a number that contribute to its precision, including all non-zero digits, any zeros between significant digits, and trailing zeros in the decimal portion.