Question

how many significant figures does the following number have: 0.002040

Explanation:

Step1: Identify non - zero digits

Non - zero digits 2, 4 are significant.

Step2: Consider zeros between non - zero digits

The zero between 2 and 4 (the first zero after 2) is significant.

Step3: Consider trailing zeros in a decimal

The two trailing zeros after 4 are significant. Leading zeros (the three zeros before 2) are not significant.

Answer:

4