# TOPIC: Significant Figures Do Now: Round 9,023.856103 to the… Tenths Ones Hundreds Thousandths - PowerPoint PPT Presentation

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TOPIC: Significant Figures Do Now: Round 9,023.856103 to the… Tenths Ones Hundreds Thousandths Thousands. We use significant figures when doing data calculations in chemistry Significant figures are important because they tell us how good the data we are using are.

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TOPIC: Significant Figures Do Now: Round 9,023.856103 to the… Tenths Ones Hundreds Thousandths

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#### Presentation Transcript

• TOPIC: Significant Figures

• Do Now: Round9,023.856103 to the…

• Tenths

• Ones

• Hundreds

• Thousandths

• Thousands

We use significant figures when doing data calculations

in chemistry

Significant figures are important because they tell us how good the data we are using are.

### Counting Significant Figuresusing the Atlantic/Pacific Rule

How to count Significant Figures

• Look for a decimal

• Decimal point absent = Atlantic Ocean

• Decimal point present = Pacific Ocean

• Start counting from first non-zero number

X 

 X

5400 m

2 sig figs

has

4 sig figs

### Decimal point absent:

• Start on Atlantic (right) side of #

• Start counting with first non-zero digit & count until reach end of #

has

5431 m

has

7 sig figs

4 sig figs

has

0.004530 km

### Decimal point present:

• Start on Pacific (left) side of #

• Start counting with first non-zero digit & count until reach end of #

2545.300 g

### Every once in a while:

_

5300 cm

A line above a zero means its significant

### Let’s practice…get out your packet

Multiplication and Division

COUNT SIG FIG for each number

Answer can only be as specific as least specific number.

Ex: if one number has 3 sig figs and the other has 5 sig figs, you answer can only have 3 sig figs

24.56 cm x 14 cm =

2 sig figs

4 sig figs

343.84 cm2

343.8 cm2

343 cm2

340 cm2

ONLY 2 SIG FIGS

### Let’s practice…try number 1-3

Underline lowest place value.

Answer can only be as specific as the least specific number

### Example

• 540 + 12.4 + 0.211 + 100 = 652.611

Hundreds

Tens

Thousandths

Tenths

Answer can only be as specific as the least specific number

More specific

+

422.63 cm

29.472 cm

115.9 cm

hundredths

Thousandths

Tenths

________________

568.002 cm

568.00 cm

568.0 cm

568 cm