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DO NOW Round to the nearest tenth:
7.16 5.54 8.66 2.65 3.469 7.673
Round to the nearest hundred:861 436 3979 1873 6758 1555
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Sig FigsTaking Uncertainty to
the Next Level
(Turn down for what?)
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Significant Figures in MeasurementThe numbers reported in a
measurement are limited by the measuring tool
Significant figures in a measurement include the known digits plus one estimated digit
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Counting Significant Figures
Number of Significant Figures
38.15 cm 45.6 ft 265.6 lb ___122.55 m ___
Complete: All non-zero digits in a measured number are
(significant or not significant).
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3
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Leading Zeros
Number of Significant Figures
0.008 mm 1
0.0156 oz 3
0.0042 lb ____
0.000262 mL ____
Complete: Leading zeros in decimal
numbers are (significant or not significant).
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2
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Sandwiched ZerosNumber of Significant
Figures
50.8 mm 3
2001 min 4
0.702 lb ____
0.00405 m ____
Complete: Zeros between nonzero numbers are (significant or not significant).
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3
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Trailing Zeros Number of Significant Figures
25,000 in. 2
200 yr 1
48,600 gal 3
25,005,000 g ____ Complete: Trailing zeros in numbers
without decimals are (significant or not significant) if they
are serving as place holders.
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Learning CheckIn which set(s) do both numbers contain the same number of significant figures?
1) 22.0 and 22.00
2) 400.0 and 40
3) 0.000015 and 150,000
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Learning CheckState the number of significant figures in each of the following:
A. 0.030 m 1 2 3
B. 4.050 L 2 3 4
C. 0.0008 g 1 2 4
D. 3.00 m 1 2 3
E. 2,080,000 bees 3 5
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Learning Check
A. Which answers contain 3 significant figures?1) 0.4760 2) 0.00476 3) 4760
B. All the zeros are significant in
1) 2.050 x 103 2) 25.300 3) 0.00307C. 534,675 rounded to 3 significant
figures is
1) 535 2) 535,000 3) 5.35 x 105
4 33
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Independent Practice Worksheet
Work alone or with a partner
Perfect time for questions
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Significant Figures in Calculations & RoundingUnit 1: Measurement & Matter
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1. COMPUTE answer first!!!!
2. CHOOSE whether to round based on sig figs or decimal places
Rounding w/ Sig Figs
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CALCULATION RULES
For Multiplication & Division
limiting term = one w/ the SMALLEST # of sig figs
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CALCULATION RULES
Multiplication & Division
Round answer to the same number of sig figs as the answer with the fewest sig figs
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Example
4.56 x 1.4 = Round to 6.4 3
sig figs
2 sig figs
2 sig figs
6.384
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Example
1.234 x 3 = Round to 4 4
sig figs
1 sig fig
1 sig fig
3.702
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For Addition & Subtraction
limiting term = one w/ the smallest number of DECIMAL PLACES
CALCULATION RULES
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Addition & Subtraction
Round answer to the same number of decimal places as the measurement with the fewest decimal places
CALCULATION RULES
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12.161 + 3.12 =
Significant Figures in Calculations
Round to 15.28
3 decimal places
2 decimal places
2 decimal places
15.281
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6.8 + 3 =
Significant Figures in Calculations
Round to 10
3 decimal places
0 decimal places
0 decimal places
9.8
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Summary Only as precise as your “weakest
link” The one w/ fewest sigs figs/decimal
places
Multiplication/ Division-> sigs figs Addition/Subtraction -> decimal
places
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1. 2.45 x 3.5
2. 8.315 ÷ 298
3. 135 x 246 x 0.000556 x 0.0998 x 155
4. 3.6x10-3 x 8.123
You Try….
8.6
0.0279286
0.0068 or 6.8x10-3
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5. 12.11 + 18.0 + 1.013 =
6. 29.63 + 24.798 + 1.263 =
7. 1081 – 7.25 =
8. 8.445 x 105 – 9.44 x 102 =
You Try…
31.1
55.691074
8.44 x 105
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16.50 mL – 8.0 mL =
3.2145 x 4.23 =
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