Circle Graphs

-Sectors of circle graphs are made from central angles

-If the sector covers 25% of the graph, the central angle is 25% of 360 (degrees) . Which is 90 (degrees).

Circle Formulas

c = (pi) d

c = 2 (pi) r

d = 2r

A = (pi) r2 

Area is the measure of space a 2D shape covers. 

Divisibility Rules

0 = ends in zero
1 = all numbers
2 = even numbers
3 = sum of the digits is 3
4 = divisible by 2 twice
5 = ends in a 0 or 5
6 = divisible by 2 and 3
8 = divisible by 2 thrice
9 = sum of the digits is 9
10 = ends in 0

Integers

Integers 

Negative numbers represent values below
zero and positive numbers represent
values above zero

eg. above and below ground or sea level

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

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

Intergers

Opposite integers have the same numeral
but different sing eg. 3 and (-3)

know what a (+) + (+) =       (+) - (+) =
                     (-) + (-) =        (-) - (-) =
                     (+) + (-) =       (+) - (-) =
                     (-) + (+) =       (-) - (+) =
                     

Divisibility

Definition:


Divisible-  Means when a number can be divided by another number, with no remainder or decimal.


(It's a whole number.)

Probability

DEFINITIONS: 

Experimental probability:  Actually doing the trails

Theoretical probability:  what you expect to happen

exam review 2012

A spread sheet organizes data in
columns and rows.

Know the ratio of circumference to
diameter of any circle is always the same.

Circumference divided by diameter is pi
3.14

exam review 2012

Variable is an unknown number

expression contains variables,

operations, and numbers, in any 

combination. 

Practice finding the pattern 

eg. 24, 21, 18, 15... 

and write equations for the patterns 

eg. 27-3n

Transformations / Measure of Central Tendency

Translation - Slide along a straight line
Rotation - turn about a fixed point
Reflection - mirror image
_____________________________________________________________________________

Median - the middle number in a set of data after data have been arranged in order
Mode - the most frequently occurring number in a set of data
Mean - the sum of a set of values divided by the number of values in a set
Range - the positive difference between the largest and smallest values in a data set
Outlier - a value that is much larger or smaller than the other data value

Exam review

Exam review: Ordered Pairs and Linear Relation 

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

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

Remember for the Exams: Converting Percents, Decimals, and Fractions

Percent: Is always out of 100

Decimals: Is always over 1

Fractions: Is always whole number over whole number.

How to Make a Perpendicular Bisector

Step 1: Open compass to just over half way of the line.
Step 2: Sharp point at point A, make an arc.
Step 3: Sharp point at point B, make an arc.
Step 4: with a ruler, join the intersections of the arc.


And you should end up with something that looks just like this:

Remember for the Exam: Geometry

Exam Review

A spread sheet organizes data in columns and rows.

Know the ratio of circumference to diameter of any circle is always the same.

Circumference divided by diameter is pi 3.14

Must remember:
Circle Formulas:
C= πd       D= 2r
C= 2πr       A= πr2


Area is the measure of space a two dimensional shape covers.


Sectors of circle graphs are made from central angles.


Integers


Negative numbers represent values below zero and positive numbers represents values above zero. 


eg. above and below ground or sea level
1+(-2)= (-1) is an 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 (+) + (+)=      (+) - (+)= 
            (-) + (-)=         (-) - (-)=
            (+) + (-)=        (+) - (-)=
            (-) + (+)=        (-) - (+)=


Practice with different numerals in each situation.

Good luck everyone! 

exam review

Divisibility rules

0- end in zero
1-all numbers
2-even numbers
3-sum of the digits in 3
4-divisible by 2 twice
5-ends in 0 or 5
6-divisible by 2 and 3
8- divisible by 2 thrice
9-sum of the digits is 9
10-ends in 0

exam review

Measure of Central Tendency

Measure of Central Tendency) A value that represents a data set.


(A data set is a group of numbers that you arrange in order from least to greatest.)

exam review

Transformations

Translation- slide along a straight line 
Rotation- turn about a fixed point 
Reflection - a mirror image
 

Remember for the Exam: Measure of Central Tendency

Measure of Central Tendency) A value that represents the centre of a data set.


(A data set is a group of numbers that you must arrange in order from least to greatest.)


Mean) The sum of a set of values divided by the number of values in the set.
Median) The middle number in a set of data after that data set has been arranged in order.
Mode) The most frequently occurring number in a set of data.


Range) The positive difference between the largest and smallest values in data.
Outlier) Value that is larger or smaller than the other data value. 
The data set might have more than one outlier or zero outliers.

exam review

Variables Expressions Ordered Pairs and Linear Relation

Variable- is an unknown number.

Expression- contains variables, operations and numbers in any combination.

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

Determine- the linear relation (equation) from a group or table of values.