sig. fig.’s in calculations!

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Sig. Fig.’s in Calculations!

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Sig. Fig.’s in Calculations!. Now that we know what a sig. digit is…. How do we use it in calculations?????. Addition/subtraction and multiplication/division. Full answers…But are these significant? 2.5cm + 2.25cm= 4.75cm 4cm x 8.332cm = 33.328cm 2. Addition/ subtraction:. - PowerPoint PPT Presentation

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Page 1: Sig. Fig.’s in Calculations!

Sig. Fig.’s in Calculations!

Page 2: Sig. Fig.’s in Calculations!

Now that we know what a sig. digit is….

How do we use it in calculations?????

Page 3: Sig. Fig.’s in Calculations!

Addition/subtraction and

multiplication/divisionFull answers…But are these significant?

2.5cm + 2.25cm= 4.75cm

4cm x 8.332cm = 33.328cm2

Page 4: Sig. Fig.’s in Calculations!

Addition/ subtraction:

The number of significant digits can be determined by the largest uncertainty.

What does this mean??

Page 5: Sig. Fig.’s in Calculations!

Multiplication/Division:

The number with the smallest amount (number) of significant figures determines the amount of significant figures in the answer of the calculation.

Page 6: Sig. Fig.’s in Calculations!

Addition/Subtraction

2.5

2. 2 5

4.7 5

+cm

cm

cm

4.8 cm

Page 7: Sig. Fig.’s in Calculations!

Multiplication/Division

4 cm x 8.332 cm 1 4

= 33.328 cm2

5

=30 cm2

1

What is the smallest number??

Page 8: Sig. Fig.’s in Calculations!

1) 2.3 cm X 12 cm=

2) 4528 g X 15 g =

3) 13.258 ml + 254 ml =

4) 14.5 cm – 4 cm =

5) 25 ml / 5 ml =

Page 9: Sig. Fig.’s in Calculations!

Lets try with calculating: Area

PerimeterVolume

Area: Length x width =

Perimeter: length + length + width + width =

Volume: Length x Width x height =

Page 10: Sig. Fig.’s in Calculations!

You try these: Remember Units!!!!!!

28.665 cm

15.2cm

17.882 cm

Find: Volume, Perimeter, Area

Perimeter

&

Area

Page 11: Sig. Fig.’s in Calculations!

Answers

Volume:7791.330456 cm3

Remember Sig. Fig’s!! = 7.80 x103 cm3

Perimeter: 87.73 cmRemember Sig. Fig’s!! = 87.7 cm

Area: 435.708 cm2

Remember Sig. Fig’s!! = 4.36 x102 cm2

Page 12: Sig. Fig.’s in Calculations!

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