Monday, September 30, 2012. 15 passed, 13 failed (passing = 70) Scores ranged from 46 to 92 Mean...
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Transcript of Monday, September 30, 2012. 15 passed, 13 failed (passing = 70) Scores ranged from 46 to 92 Mean...
![Page 1: Monday, September 30, 2012. 15 passed, 13 failed (passing = 70) Scores ranged from 46 to 92 Mean score: 69.3.](https://reader030.fdocuments.in/reader030/viewer/2022032707/56649e225503460f94b0fe4d/html5/thumbnails/1.jpg)
Moving on in Math 010
Monday, September 30, 2012
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15 passed, 13 failed (passing = 70)
Scores ranged from 46 to 92
Mean score: 69.3
How did we do on the exam?
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Class distribution of scoresN
um
ber
of
studen
ts
Score
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Why did half the class fail?
How can class time be most effective for you?
How important is your success in this class to you?
This week, take some time to think about these questions and your goals for this class.
My goal: I would like to see ¾ of the class pass the course.
Questions to think about…
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Conference sign-up◦ Class on 10/7 canceled for conference time
Conference will be worth 8 quiz grades◦ Easy grade booster – attend and you will get 80/80
Need to attend your conference ON TIME to receive your exam back & full credit (no show = lost points)
A chance to voice your needs and concerns
Now what?
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The exam will be on Wednesday, October 23
Topics:◦ Decimals◦ Square roots◦ Inequalities ◦ Working with variable expressions
Calculators can now be used
Homework late policy is now in full effect
Moving on… to Exam #2
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Better than fractions. Don’t you agree?
Used in all fields & professions, for example:◦ Medical◦ All sciences◦ Any subject that uses statistics (Psych, Sociology)
Use the same rules as integer arithmetic… ◦ with a couple of extra rules you need to know,
coming up (hint hint will be on the EXAM hint)
Decimals: Why, where, how?
![Page 8: Monday, September 30, 2012. 15 passed, 13 failed (passing = 70) Scores ranged from 46 to 92 Mean score: 69.3.](https://reader030.fdocuments.in/reader030/viewer/2022032707/56649e225503460f94b0fe4d/html5/thumbnails/8.jpg)
Make sure the decimal points line up.
Adding decimals
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Another example
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Count up the total number of digits after the decimal points.
Then, count that total number from the right of your answer, and place the decimal point.
Multiplying decimals
![Page 11: Monday, September 30, 2012. 15 passed, 13 failed (passing = 70) Scores ranged from 46 to 92 Mean score: 69.3.](https://reader030.fdocuments.in/reader030/viewer/2022032707/56649e225503460f94b0fe4d/html5/thumbnails/11.jpg)
More decimal multiplication
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One more example
0
![Page 13: Monday, September 30, 2012. 15 passed, 13 failed (passing = 70) Scores ranged from 46 to 92 Mean score: 69.3.](https://reader030.fdocuments.in/reader030/viewer/2022032707/56649e225503460f94b0fe4d/html5/thumbnails/13.jpg)
And… one more example
0
![Page 14: Monday, September 30, 2012. 15 passed, 13 failed (passing = 70) Scores ranged from 46 to 92 Mean score: 69.3.](https://reader030.fdocuments.in/reader030/viewer/2022032707/56649e225503460f94b0fe4d/html5/thumbnails/14.jpg)
Decimals are essentially fractions; they represent a part of a whole.
0.5 is one-half◦ Think 0.50 -> $0.50 is fifty cents, half of a dollar
0.25 is… (write down your guess)◦ $0.25 is what fraction of a dollar?◦ A quarter -> one-fourth
0.75 is… (write down your guess)◦ What does $0.75 look like?◦ Three quarters -> three-fourths
What do decimals mean anyway?
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The more zeros after the decimal point, the smaller a decimal is.◦ Smallest to largest: 0.005 < 0.05 < 0.5◦ Even when: 0.01 > 0.00997987486◦ 0.01 is bigger because of the number of zeros
Zeros at the end of a decimal may occur, but they don’t mean anything.◦ So, 0.5 = 0.50 = 0.500 = 0.500000000000000000
Decimals: greater than, less than
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Decimal place values
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What place values really mean
https://www.khanacademy.org/math/arithmetic/decimals/comparing-decimals/v/comparing-decimals-1-example
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A perfect square is a number that is any integer squared, aka times itself.
Next topic: Perfect squares
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Also called radical expressions
Inverse operation of “squared”
Easy to find square roots of perfect squares
Calculator
Square roots
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Just complete the 3-2-1 slip and you will receive a 10/10.
The quiz next class will involve math.
Today’s quiz involves no math.