todays math review

today in math we talked about many things first of all we reviewed circle formulashttp://www.blogger.com/img/blank.gif
variables: c= circumfurance (the Distance around) d= diameter( from one side through the middle to the other) r= radius (half the diameterhttp://www.blogger.com/img/blank.gif) A= area (space it takes up) pi= 3.14http://www.blogger.com/img/blank.gif

fomulas: c=pi times d d=2 times r r= diameter divided by 2 A= pi times radius squared (times it self)

eg. if d = 6 then the radius is 3 and the circumfirence is 18.84 so the area must be 113.04.

the anwser is 314

Integer Review

This is an exam review for integers

Negetive number represent values below 0 and positive number represent values above 0.

Real life examples are sea level (above or below sea level) and temperature (above or below 0 degrees)

1+(-2)=(-1) is a addition statement

3-(-1)=4 is a subtraction statement

Opposite Integers have the same numeral but different sign Eg. 3 and (-3)

Know what a (+)+(+)= + (-)+(-)= - (+)+(-)= + or - (-)+(+)= + or - (+)-(+)= + or - (-)-(-)= + or - (+)-(-)= + (-)-(+)= -

Pratice with different numerals in each situation

Write an addition statement for the following diagram

5+(-12)+4=(-3)

Take this quiz to see how much you know about integers.

Measures Of Central Tendency

Measures of Central Tendency- a value that represents the centre of a data set
Data set is a group of numbers that you must arrange in order from least to greatest

Median- the middle number in a set of data after the data have been arranged in order
median of 2, 5, 6, 8, 9 is 6

Mode- the most frequently occurring number in a set of data
mode and most both have 4 letters
mode of 3, 5, 7, 7, 9 is 7
mode of 2, 2, 4, 6, 6, 8, 11 is 2 and 6
mode of 1, 2, 3, 5 is no mode
mode of 1, 1, 1, 2, 2, 2, 3, 3, 3 is no mode
mode of 1, 1, 1, 2, 2, 2, 3, 3, 3, 4 is 1, 2, and 3

Mean- a measure of central tendency, the sum of a set of values divided by the number of values in the set
mean of 6, 4, 8 is 6 6+4+8=18 18 divided by 3= 6

Range- the positive difference between the largest and smallest values in a data set
range of 1, 3, 4, 5, 5, 6, 6, 8, 8, 9 is 8 9-1=8
range of -7, -4, -2, -1 is (-1) - (-7)=6

Outlier- a value that is much larger or smaller than the other data value
the data set may have more than 1 outlier or 0 outliers
outlier of 1, 64, 65, 67, 67, 68, 100 is 1 and 100

Here is a video link:

http://www.youtube.com/watch?v=TD_utDA7P6A&feature=related

Math exam review page 1

In class we are talking about exams and here is some notes we did

Transformation-a movement on a coordinate grid or a shape and image

Translation-slide along a straight line

Rotation- turn about a fixed point

Reflection- mirror image

know how t

o describe each of them.

Know how to plot points where does (1,-3) go on a coordinate grid

(+,+) quadrant I

(-,+) quadrant II

(-,-) quadrant III

(+,-) quadrant IV

Adding, subtracting, multiplying, and dividing decimal numbers USING A CALCULATOR

Questions

21.34+32.56+1.09=

675.42-324.78=350.64=

23.78x5.06=

678.987/8.17=

Answers

54.99

350.64

120.3268

83.11

(34.67 + 23.65) x5.6 /11.2=29.16

BEDMAS

23.45 + 18.1 = 41.55

Perpendicular Bisector-2 lines that meet and cuts the other in half

Parallel lines- they never meet

Perpendicular-lines that meet 90 degrees

Intersecting-lines that intersect

If the angle is 52 degrees and gets bisected what are t

he measures of the two new angles?

Angle bisector- a line that cuts an angle in half

Area of a triangle-b x h divide by 2

Convert fractions, decimals, and percent.

fractions-have to be whole number

decimals-over 1

percent-out of 100

Here is a link http://www.squidoo.com/OrderOfOperations

Here is a video about Transformations

Order of Operation

this is called BEDMAS
Brackets
Exponents
Divisions
Muliplication
Additon
Subtraction

eg

this video will help if you didnt understand this http:// width="425" height="349"

sorry its a very late

Math: Exam Review p.2

Write an addition statement for the following diagram


5 + (-12) + 4 = (-3)

~**~**~**~ Next Slide~

Variable is an unknown number

expressions contains variables, operations. and numbers, in any combination. (not an equal sign)

Practice finding the pattern
eg. 24, 21, 18, 15. . .
and write equations for the patterns
e.g 27-3n

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Plot ordered pairs and determine whether or not they make a pattern

Determine the linear relation (equation) from a graph or table of values





Y= 2x

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Mean - add up all values divided by how many values three are.

Median - the middle number in a set of ordered values, might be the mean of 2 middle values.

Mode - the value that shows up the most.

Range - positive difference between largest and smallest values

Outlier - values that are too big or too small compared to the other values. (Big one take away the little one)

~**~**~**~ Next Slide~

Write expressions or equations when given pictures
eg.


Create diagrams or pictures when given the expression of equation.

Expression:
3x - 4

Equation:
2y + 3 = 15

Math Exam Review

Here is a link:

Here is a video: