Thurs 11/19 Lesson 5 – 1 Learning Objective: To classify polynomials Hw: 5.1 – 5.2 WS.
WARM UP8-26-13 Agenda Quiz Unit 1 Notes Unit 1-4 WS Unit 1 Density Work on online HW Homework Aug 28...
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Transcript of WARM UP8-26-13 Agenda Quiz Unit 1 Notes Unit 1-4 WS Unit 1 Density Work on online HW Homework Aug 28...
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WARM UP 8-26-13
AgendaQuiz Unit 1Notes Unit 1-4WS Unit 1 DensityWork on online HW
HomeworkAug 28 – Online HW unit 1Aug 31 - Test review WSSept 2 – Test unit 1
1. Find the density of this solid, mass = 180 grams
2. Find the mass of an object if it takes up 4 cm3 and has a density of 5 g/cm3
3. Find the volume if an object weights 70 grams and has a density of 14 g/cm3
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Unit 1-4Rounding Measurements
Accuracy- how close a measurement is to the actual value
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Rounding Measurements Precision- how frequently you get the same
measurement when measuring in the same way
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Rounding Measurements Round the following numbers: 5.76 to the nearest tenths 453 to the nearest tens 3.685 to the nearest hundredths
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Scientific Notation Used to make numbers easier to deal with
and to keep track of zeros
Only one number before decimal!
Using calculators with scientific notation: Number * 10 ^ (exponent) Number EE (exponent)
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Scientific Notation Examples
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Assignments Unit 1 density WS due today before leaving
class
Online HW Unit 1
Test review WS
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EXTRA NOTES NOT APPLICABLE
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Significant Figures Significant figures are used to indicate the
preciseness of measurements
- Significant figures consist of all the digits known with certainty as well as one estimated, or uncertain digit
- Use for rounding answers
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Rules for Determining Significant Figures
1. Nonzero digits are always significant
e.g. 643.5 has 4 sig figs
2. Zeros between nonzero digits are significant
e.g. 909 has 3 sig figs
3. Zeros in front of non zero digits are not significant
e.g. 0.00034 has 2 sig figs
e.g. 00063
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Rules for Determining Significant Figures
4. Zeros both at the end of a number and to the right of a decimal point are significant
e.g. 9.00 has 3 sig figs
5. Assume zero to the right of a number but to the left of the decimal point is not significant
e.g. 4000 has 1 sig fig, but 30.0 has 3 sig figs
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Sig Fig Practice
Determine the number of sig figs in each value
a)4658.2
b)4006
c)0.000265
d)0065
e)1.0065
f)3.0
g)700
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Sig Figs in Calculations When multiplying and dividing, round your
answer to the least number of sig figs in the equation
Multiplying and Dividing
a)12 x 4 = ?
b)1.0 x 623 = ?
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When adding and subtracting, round youranswer to the least number of decimal placesin any of the data you are given.
Adding and Subtracting
a)3.11 + 1.2 = ?
b)9.899 – 2.23 = ?
Sig Figs in Calculations