Scientists express uncertainty in measurement using significant figures. Significant figures indicate the precision of a measurement by showing how many digits are known with certainty. Rules for significant figures determine how measurements are rounded and how calculations with measurements are carried out while accounting for precision. Scientific notation is used to express numbers in a standardized form and make them easier to work with, particularly for very large or small numbers.

1. How do scientists express uncertainty in measurement?

2. What is the length of the board?

3. … how about now?

4. Is this any better?

5. One last time…

6. Reporting measurements using significant figures

7. Reporting Measurements using significant figures

9. Rules for determining significant figures

12. Calculations with Significant Figures

13. Carry out the following calculations and report your answer with the correct number of significant figures.

17. Write each value in scientific notation.

19. Rules for calculations with scientific notation.

21. Calculate

22. Calculate

23. Calculate

24. SI Base Units

25. SI Unit Prefixes