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.

Circumference, Area and Sectors

Exam Review

Know the ratio of the circumference to diameter of any circles always the same. 

Circumference divided by the diameter = 3.14

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

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.

An Independent Event and a Sample Space

Independent Event - The outcome of 1 event has no effect on the outcome of another event.

Sample Space- All possible outcomes of an experiment.

Quadrants

  
( +,+) Quandrant I
(- , +) Quandrant II
(- , -) Quandrant III
(+ , -) Quandrat IV

Mean, Median, Mode, Range, Outlier

Mean- Add up all values divide by how many values there are.

Median- The middle number is 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 small compared to the other values.

Fractions with Whole Numbers

Questions...

3 2/3 - 2 1/3 = 1 1/3

2 3/6 - 2 1/6 =2/6

2 3/4 - 1 1/4 = 1 2/4

2 2/5 - 2 1/5 = 1/5

3 1/4 - 1 1/4 = 2 wholes

Equivalent Fractions

Fractions

Questions...

23/40 + 7/40 = 30/40

34/40 + 6/40 = 40/40 or 1 whole

12/23 - 2/23 = 10/23

2/6 + 1/6 = 3/6 or 1 half

12/10 + 1/10 = 1 whole and 3/10

Fractions into Pictures

Fractions into Pictures

Question...

Question...

A group of students are playing Rock Paper

Scissors. 2 students leave the group.

answer=s-2

Group of Students=unknown amount

Take away 2 from group of students.

s=Variable

2= Constant

What is a Variable

What is a Variable?

A Variable is a letter that represents an unknown number.

e.g. x,a,n
(it could be any number)

Divisibility Rules

Divisibility Rules

#1: All whole numbers are divisible by 1

#2: All numbers that end in 0,2,4,6,8 are divisible by 2

#3:All sums of the digits is divisible by 3

#4: All numbers that can be divided in 2 twice are divisible by 4

#5: All numbers that end in 0 or 5 are divisible by 5

#6: All numbers that are divisible by 2 and 3 are divisible by 6

#8: All numbers that can be divided in 2 thrice are divisible by 8

#9: All sums of the digits are divisible by 9

#10: All numbers that end in 0 are divisible by 10

Example for #1: Whole numbers, no decimals.

Example for #2: The last number has to end in an even number.

Example for #3: e.g. 9+8+3+1+4+2=2+7=9 =983142 is divisibile by 3.

Example for #4: Cut the number in half 2 times. e.g. 200 divided by 2=100 divided by 2=50Yes! = 200 is divisible by 4.

Example for #5: 12345 is divisible by 5 because the last number is 5. 1234567890 is divisible by 5 because the last number is 0. 54321 is not divisible by 5 because the last number isn't 5 or 0.

Example for 6: e.g 6+3+9+6+3+9+6=4+2=6, so 6396396 is divisible by by 6.

Example for #8: Cut the number in half 3 times. e.g. 400 divided in 2=200 divided in 2 =100 divided in 2= 50Yes! = 400 is divisible by 8.

Example for 9: e.g. 1+8+9+7+2+3+6=3+6=9 = 9 is divisible by 9.

Example for 10: 12340 is divisible by 10 because the last number is 0. 12345 is not divisible by 10 because the last number isn't 0.

What Fractions Equal 1?

When the Numerator (up) and the denomenator (down) have the same number.

Click Here for Fraction Games!

e.g) 3/3=1

4/4=1

5/5=1........

Divide it by the same number !

Order Of Operations

BEDMAS Question:

click here to answer BEDMAS questions!

Math

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