1. Today’s Catalyst
Identify the number of significant figures in each of the numbers below:
22.34 x 104
1,534,000 4 3 4 4

2. Write each of the following numbers in standard notation.
x 10-8
x 102
974

3. Today’s Catalyst
Round the following numbers to three significant figures.
x 104
9. How are small fires extinguished in lab? Write your answer in at least two complete sentences.
8.43
4.58 x 104

4. Today’s Game Plan Catalyst 10 minutes Binder Set Up 3 minutes
Laying Down the Law…Of Significant Figures (multiplication/division)
5 minutes
Work it Out!
Laying Down the Law…Of Significant Figures (addition/subtraction)
Scientific Notation Prove-It!
Assign Homework
2 minutes

5. 1) Fill out Unit 1 Table of Contents 2) File away papers
Organize that Binder!
1) Fill out Unit 1 Table of Contents
2) File away papers
Significant Figures in Calculations

6. Significant Figures in Calculations & Rounding

7. Significant Figures in Calculations
For multiplication & division
The limiting term is the one with the smallest number of significant figures
Round to
6.4
4.56 x =
3 sig figs
2 sig figs
2 sig figs

8. Significant Figures in Calculations
Multiplication & Division
Smallest number of significant figures

9. Work it Out! Swivel Style
Work out the following 4 problems with your lab partner on the back of your notes sheet:
2.45 x 3.5
8.315 ÷ 298
135 x x x x 155
(3.60 x 10-3) x (8.123) ÷ 4.3

10. Significant Figures in Calculations
For addition & subtraction
The limiting term is the one with the smallest number of decimal places =
Round to
15.28
2 decimal places
3 decimal places
2 decimal places

11. Significant Figures in Calculations
Addition & Subtraction
Smallest number of decimal places

12. Work it Out! Swivel Style
Work out the following 4 problems with your lab partner on the back of your notes sheet: = =
1081 – 7.25 =
x =
9.445 x 102

13. Today’s Game Plan Catalyst 10 minutes Track Prove-It/Binder 3 minutes
Laying Down the Law…Of Significant Figures (multiplication/division)
5 minutes
Work it Out!
Laying Down the Law…Of Significant Figures (addition/subtraction)
Scientific Notation Prove-It!
Assign Homework
2 minutes

14. Today’s Homework
Summary of Learning
Significant Figures worksheet