1. What do they do if someone moves in? Comments?

3. If you counted everyone in Pekin, would you come up with 33,900

4. Significant Figures or “Sig Figs” 0 1 Whose more important, me or you?

5. Odometer on your car DO NOT mean a number is important or not DOES indicate the precision of a number Significant Figures or “Sig Figs”

6. The 1 st calculation of the Everest’s height was done in 1852 by Radhanath Sikdar He calculated --> 29,000 ft He reported --> 29,002 ft. WHY? Latest Measurement is 29,028 ft.

7. See Sig Fig cards Look at the examples and come up with 3 rules for when a number is significant or not 1.) Any number 1-9 is always significant 2.) 3.) 4.) Come up with 3 more on a piece of paper with your groups name on it to turn in

8. The Rules 1.) Non-zero numbers are always significant 1, 2, 3, 4, 5, 6, 7, 8, 9 and so is a zero with a line over it (it does not mean repeating in this class) 12 ft 2 sig figs.4512 cL 4 sig figs Examples 32.2 mm 3 sig figs 140 ms 3 sig figs

9. The Rules 302 s 3 sig figs 4.0552 kL 5 sig figs Examples 300.2 cm 3 4 sig figs 1,000,000,001  g 10 sig figs 2.) 0’s between Sig Figs are always significant. 50500  g 5 sig figs

10. 3.) 0’s to the left of all non-zero numbers are never significant The Rules 0035 mi 2 sig figs.000898 g 3 sig figs Examples 00.000003 L 1 sig figs These zeros don’t mean anything These zeros are just place holders

11. 4.) 0’s to the right of all non-zero numbers are only significant if they are to the right of a decimal. ( or if they are between 2 sig figs) The Rules 35,000 in 2 sig figs 0.050 kg 2 sig figs Examples These zeros are just placeholders 600.000 s 6 sig figs 780.0 cm 4 sig figs

12. The Rules 4 apples Number of people in the class room Examples 5.) Measurements done by counting have infinite Sig Figs (Infinite Precision). So do numbers that are considered perfect by definition. counted By definition 12 inches = 1 foot water freezes at 0 o C 1 inch = 2.54 cm

13. HOW MANY SIG FIGS 120 mm 6306 g.008909 L 1.0050 dm

14. HOW MANY SIG FIGS 00.005000 cs 890.00 kg 10000  s 360,000 mL

15. The Guess # ? is the furthest SIG FIG to the right 654 ft.005 s 8,500 s 40.00 s

16. Find the Guess 120 mm 6306 g.008909 L 1.0050 dm

17. HOW MANY SIG FIGS 00.005000 cs 890.00 kg 10000  s 360,000 mL

18. The easy stuff - Sig Figs with scientific notation 2.4 x10 5 coefficient base exponent All numbers in the coefficient are significant. Ignore everything else 2.4 x10 5 2 Sig Figs 5 x10 9 1 Sig Figs 1.00005 x10 1 6 Sig Figs

19. Rounding to # of Sig Figs Find the left most SIG FIG. (biggest 10’s place) Count to the right the number of sig figs to keep. If the number to the right is 0-4 round “down” If the number to the right is 5- 9 round up

20. round to 2 SFs Round the following round to 1 SF 52.38 round to 3 SFs 49.56 round to 3 SF round to 2 SF round to 1 SF

21. Round the following.00070008 round to 4 SFs round to 3 SFs round to 2 SFs round to 1 SFs 50095 round to 4 SFs round to 3 SFs round to 2 SFs round to 1 SFs