1. Significant
Digits

2. I. Significant Digits
A. Are numbers who carry meaning and contribute to accuracy.
B. The Rules:
1. Nonzero digits are significant
2. Final zeros after a decimal point are significant
3. Zeros between two significant digits are significant
4. Zeros used only as placeholders are not significant

3. POP QUIZ TIME!
Tell me how many significant digits AND the rules used to figure this out.

4. Practice
Rule g g nm s s mm mm
Two significant digits. (1 & 2)
Three significant digits ( 1 & 2)
One significant digit (2 & 4)
Four significant digits (1, 2, & 3)
Three significant digits (1 & 3)
Three significant digits (1, 2, & 4)
Two significant digits (1 & 4)

5. II. How Science Works
A. The _________________ is a way to solve problems
scientific method
B. Scientific Method Steps
1. Observe
2. Ask a Question
3. Research/Collect Data
4. Form a
Hypothesis
a. Hypothesis - A possible answer
5. Experiment (test hypothesis)
6. Draw conclusion