Monday, September 30, 2012. 15 passed, 13 failed (passing = 70) Scores ranged from 46 to 92 Mean score: 69.3.

Moving on in Math 010

Monday, September 30, 2012

15 passed, 13 failed (passing = 70)

Scores ranged from 46 to 92

Mean score: 69.3

How did we do on the exam?

Class distribution of scoresN

um

ber

of

studen

ts

Score

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…

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?

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

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?

Make sure the decimal points line up.

Adding decimals

Another example

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

More decimal multiplication

One more example

0

And… one more example

0

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?

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

Decimal place values

What place values really mean

https://www.khanacademy.org/math/arithmetic/decimals/comparing-decimals/v/comparing-decimals-1-example

A perfect square is a number that is any integer squared, aka times itself.

Next topic: Perfect squares

Also called radical expressions

Inverse operation of “squared”

Easy to find square roots of perfect squares

Calculator

Square roots

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.