Question

how many significant figures does the following number have: 100.00210

Explanation:

Step1: Recall significant - figure rules

Non - zero digits are always significant. Zeros between non - zero digits are significant. Trailing zeros after a decimal point are significant.

Step2: Analyze the number 100.00210

The non - zero digits are 1, 2, 1. The zeros between 1 and 2 (the two zeros in 100.00210) and the trailing zero after 1 are significant.

Answer:

8