Question

how many significant figures are in this number ? 650.

Explanation:

Step1: Recall significant figure rules

Significant figures: non - zero digits are significant; trailing zeros after a decimal or in a number with a decimal (even if the decimal is at the end) are significant. For the number 650., the decimal at the end indicates that the trailing zero is significant.

Step2: Count significant figures

The digits are 6, 5, and 0. All three are significant because the decimal after 0 shows that 0 is a significant figure (it's not just a placeholder).

Answer:

3