1. Significant Figures Aren’t all numbers important?!?!?!?
Yes, but some are more significant than others…

2. What is accuracy?
What is precision?

3. Accuracy / Precision
Accuracy – the agreement between a measured value and a true value.
Precision – agreement between several measurements of the same quantity.

4. Accuracy / Precision

5. Significant Figures
A measurement can only be as accurate and precise as the instrument that produced it.
A scientist must be able to express the accuracy of a number, not just its numerical value

7. Significant Figures
We can determine the accuracy of a number by the number of significant figures it contains.

9. The AMAZING sickles Arrow Method
If there IS a decimal point present, start on the left and draw an arrow to the right until you reach a NON-ZERO number.

10. The AMAZING sickles Arrow Method cont’d.
If there is NOT a decimal point present, start on the right and draw an arrow to the left until you reach a NON-ZERO number.

11. Determine the number of significant figures in the following numbers.
0.02 _____
0.020 _____
501 _____
501.0 _____
5,000 _____
5,000. _____
6, _____
_____
_____
10,001 _____
______
______
______
2.000 x ______
______
90, ______
4.7 x ______
10,800,000. ______
3.01 x ______
______