Question

the measurement, 206 cm, has how many significant (measured) digits? a 1 b 2 c 3 d 4 e 5

Explanation:

Step1: Recall significant digit rules

Significant digits: non - zero digits are significant; zeros between non - zero digits are significant.
For the number 206, the digit 2 is non - zero (significant), the 0 is between 2 and 6 (significant), and the digit 6 is non - zero (significant).

Step2: Count the significant digits

Count the significant digits: 2, 0, 6. So there are 3 significant digits.

Answer:

C. 3