Math Exam Review (Page 6)

Divisible- means when a number can be divided by another number, with no remainder or decimal. It should be a whole number.


Always remember when you're adding and subtracting fractions, you should always simplify (put it into lowest terms)





Here is a LINK of where you can learn facts about divisibility
But, If you want to learn about Adding and Subtracting fractions, here is also a LINK.

Math Exam Review (Page 1)

Transformations


Translation- A slide along a strait line


Rotation-Turn about a fixed point

Reflection-Mirror Image

Quadrant I (+,+)
Quadrant II (-,+)
Quadrant III (-,-)
Quadrant IV (+,-)

Adding, Subtracting, Multiplying, and Dividing decimal numbers using a calculator. Here are some exercises you can try with your calculator. (I just made those up, because we already did the examples in class)

1.)43.12 + 65.23 + 9.01=
2.)24.576 - 23.07=
3.)6.05 x 87.32=
4.)71.08 ÷ 12.04=

Math Notes

Measures of central Tendency
- A value that represents the centre of a data set
-It can be Mean, Medium or Mode
-A 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


If this^ happens, all you have yo do is find out what number is in between the two numbers. So take 6 and 8, You know that 7 is in between so, 7 is our median. Another way to find out the median...
Take the two middle numbers (6 and 8) add them together (6+8) and that would equal 14 right? So, you take 14, and divide it by 2 (14÷2) and that would equal 7, and seven (7) is our Median.


If this^ happens, remember the first thing you do when you get a data, you have to arrange them from least to greatest, after you do that and you get two numbers in the middle and you wanted to find out the Median, remember: take the two middle numbers (3 and 10) add them together (3+10) and that would equal 13 right? So, you take 13, and divide it bye 2 (13÷2) and that would equal 13, and thirteen (13) is our Median.

Mode- the most frequent occuring in a set of data. Here is how you can remember the meaning, MODE and MOST have both 4 letters and they both start in "MO".

(e.g) 3,5,7,7,9
the Mode would be "7" because it's the most occuring number, there are two of them and only one the other numbers.
(e.g) 2,2,4,6,6,8,11
the Mode would be 2 and 6, because there are two and them and they are both tied for having two numbers.
(e.g) 1,1,1,2,2,2,3,3,3
the Mode is nothing because there are three of them for each number.
(e.g) 1,1,1,2,2,2,3,3,3,4
If this happens, the mode this time would be 1,2 and 3, because they are all tied for being first.

Mean- A measure of central tendency. Th sum of a set of values divided by the number of values in the set.





The Mean in this^ image is 6, because the data states 4, 6, and 8, So you take all the numbers in the data (4, 6, and 8) and then add them up (4+6+8) and then that would equal 18 right? So, take 18 and divide it by how much numbers there are in the data, In this data there are 3 numbers, (18÷3) and that would equal to 6, So 6 is our Mean.


Range- The positive difference between the largest and smallest values in a data set.

If this^ happens, always remember when you get a data set, you have to order them from least to greatest, after you do that you take the biggest number (in this situation it's #9) and the smallest number (in this situation it's the #1) and subtract the biggest number to the smallest number (9-1=8) and that would equal to 8, so 8 is our Range.

Outlier- A value that is much longer or smaller than the other data value, the data set may have more than 1 outlier or zero outliers.

The outliers for 1,67,68,67,64,65,100 would be 1 and 100, because the rest of the numbers are somewhere in the 60's and 1 and 100 are so far off.

MATH HOMEWORK FOR TODAY:

Find out the Mean, Mode, Range, Outliers, for the following data set.
1.) 18,19,79,17,20,12

2.)14,14,16,15,1,16

3.)98,202,99,91,2,95,89,88,94

*Here is a LINK where you can learn more facts about Measures of Central Tendency.

*Here is also a link to a VIDEO about Mean, Median and Mode.

Math Notes

*If you're having trouble with this^ example, here is a video about SUBTRACTING integers. If you also would like to see a video about ADDING integers, here is another one.

Here is also a WEBSITE about equations.

*These were the notes we took down on Friday, I'm sorry if I posted it a little late.

HOMEWORK: Finish homework booklet pages 134-139.. and finish Chapter Review and Practice Test in our TEXTBOOK.

Math notes for June 2, 2011

Practice: Show every step... then check

A+4=10
6+4=10
10=10

Use reverse order of operation, what you do the first one, you have to do to the other. (As you can see when we used reverse order of operation the first time, we also did the same at the end)

Here are some other practices we did:

CHECK:
B-2=5
7-2=5
5=5


CHECK:
3c=21
3x7=21
c=7


CHECK:
2j+1=9
2(4)+1=9
8+1=9
9=9


CHECK:
f÷3-2=1
9÷3-2=1
3-2=1
1=1

Here is a LINK where you can practice with algebra.

Here is also a VIDEO about equations.

*I was having trouble with the video, so just click the link and you will get to it! :)

Chapter 3 review # 8-10

8.) Copy these line segments. Draw the perpendicular bisectors using two different methods . Measure the two parts of each bisected line segment. Record each set of measurements.






a.) I used a compass to find out the perpendicular bisector.


b.) I used a right triangle and a ruler.

9.) A support must be placed under the pool table at it's centre. Make a sketch of the pool table. Draw the position of the perpendicular support. Label the support and label the measures of the table lenghts on each side of the support.

*The lenght of the pool table is 3.5 cm and the width of the pool table is 8.5 cm.


10.) You draw a 30 cm line segment. You then draw a perpendicular bisector of one of the bisected line segments.




(*not exactly 30 cm. 30 cm is too long, that line segment is 14 cm)

a.) What is the lenght of the shortest line segment?

-The lenght of the shortest line segment is 3.5

b.)How does the length of the shortest line segment compare to the lenght of the original line segment?

-The shortest line segment is 'shorter' compared to the original line segment.

Here is a video about constructing a perpendicular bisector.

B.E.D.M.A.S question

Here is the problem I did using the numbers from 1-9 and B.E.D.M.A.S. The answer is 7.

Order of Operations - B.E.D.M.A.S

B-Brackets

E-Exponents

D-Division

M-Multiplication

A-Addition

S-Subtraction



Division and Multiplication goes from left to right and if you see the first number you divide it and then you multiply it.



Solution to question #3

Liya went to the bookstore and bought 5 books, each book costs $1.60. She also wanted to buy a bookmark, 1 bookmark costs $1.25, When she saw a really cool pen, she also wanted to buy it, 1 pen cost $2.50. Liya has $15.00, Does she have enough money for the total costs?

Answer: Yes, because the total cost is $11.75, and she has $15.00.

If you still need help with B.E.D.M.A.S, you might want to click this link.