841Ardia+S

__Mean, Median, Mode -__


 * Numerical order** : it is putting a set of numbers in order in ascending (1,2,3,4) or decending (4,3,2,1) order


 * Mean** : is calculating the sum of all data and then divide it by how much pieces of data there is.

example : 2, 5, 6, 15 .......... 2 + 5 + 6 + 15 = 28 ........... 28 divided by 4 7


 * Median** : is the middle number. to get the median you need to first put the numbers in order from smallest to largest.

example : 2, 5, 6, 15 .... there is 2 middle numbers .. so you have to find the average of both numbers .. by adding and dividing .. just like what happens when you find out the mean .. so 5 and 6 are the middle numbers .. 5+6=11 .. 11dividedby 2 = 5.5

1) you can have NO mode 2) you can have A mode 3) you can have more than one mode
 * Mode** : is the number that shows up the most in one set of data .. there are 3 kinds of modes

example : 1) 2, 5, 6, 15 .. NO MODE 2) 2, 2, 5, 6,15 .. **2** is the mode 3) 2, 2, 5, 5, 6, 15 .. 2 AND 5 are the modes

Find the mean, median, and mode for the following set of numbers : 8, 4, 3, 3, 5, 7
 * __QUESTION__**

MEAN : 3 + 3 + 4 +5 +7 +8 =30 / 6= 5 so the mean is 5

Median : 3 3 4 5 7 8 .. 4 + 5 =9 /2= 4.5

Mode : 3

841ASanswers

__Square Roots -__
 * Perfect Square** : any square that has the same whole number for all sides

example : 16 is a perfect square because 4X4 (length x width) = 16


 * Square Root** : is a number that times itself that equals a number

example : the square root of 16 is 4 because 4X4=16

Finding a square root without a calculator: If you have to find the square root for a number that is not on the square root chart, you have to look for 2 sqaure roots that are closest to the number you are looking for

example : find the square root of 10 .. the closest square root is (3X3) 9 and its LESS than 10 .. the next square root is (4X4) 16

then you subtract the first square root from the other square root to get the denominator of your answer.

example : 9 - 16 = **7** .. seven will be the denominator of this fraction

Subtract the perfect square that is SMALLER from the number you are trying to find the square root of.

example : 10 - 9 = 1 .. so 1 will be the numerator of this fraction

Finally you use the whole number of the previous square root and then the fraction that you've just figured out

example : sqrt 9 is **3** and the sqrt of 10 is 3 and 1/7


 * FACTORS || PRODUCT ||
 * 1 X 1 || 1 UNIT ² ||
 * 2 X 2 || 4 UNIT ² ||
 * 3 X 3 || 9 UNIT ² ||
 * 4 X 4 || 16 UNIT ² ||
 * 5 X 5 || 25 UNIT ² ||
 * 6 X 6 || 36 UNIT ² ||
 * 7 X 7 || 49 UNIT ² ||
 * 8 X 8 || 64 UNIT ² ||
 * 9 X 9 || 81 UNIT ² ||
 * 10 X 10 || 100 UNIT² ||

__**QUESTION -**__

Find the square root of the following numbers :

1) 21 (4X4) 16 21 (5X5) 25 25-16= 9 21 - 16 = 5 the sqrt of 21 is 4 and 5/9

2) 7 (2X2)4 7 (3X3)9 9-4=5 7-4=3 the sqrt of 7 is 2 and 3/5

3) 88 (9X9) 81 88 (10X10)100 100-81=19 88-81=7 the sqrt of 88 is 9 and 7/19

841ASanswers

__Percent -__


 * Percent** : is a PART of 100, it can also be MORE than 100

HINT : how to make a number into a percent .. First you get a number .. say 72 Then you DIVIDE the number by 100 (72 dividedby 100 = 0.72 or 1%)

Is taking 15% off a given item and then an additional 10% off the reduced price the same as taking 25% off the original price? Why or why not?

No

$82 / 100 = 0.82 or 1% 0.82 X 15 = $12.30 12.30 - 82 = $79.70

79.70 / 10 = 7.97 or 10% $7.97 - $79.90 = $**71.73**

takeing off 25%

82/4 = $20.50 or 25% 82 - $20.50 = $69.50

841ASanswers

__**Ratio and Proprotion -**__

examples: (Using equivalent fractions) If 3 cd's cost $36 .. how much are 5 cd 's ?

[|Example]

__Question 1)__ On a recent trip Mya drove at an average speed of 110 km/hr, How long wou

lf it take her to travel 800 km ? kmh / total km 110/800 / 10.... 11/80 = 7.27

use equivalent fractions on this question

__Question 2)__ use a Ratio table for this question


 * A || B ||
 * 9 || 18 ||
 * /9 || /9 ||
 * 1 || 2 ||
 * X6 || X6 ||
 * 6 || 12 ||

841ASanswers

links : heres the link for my [|B. O. B.] heres the link for my [|growing post] heres the link for one of my [|scribes]


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 * Question for parent to do || /2 || /2 || /2 || /2 || /2 ||
 * Answer with explanation || /2 || /2 || /2 || /2 || /2 ||
 * Parent Notes explaining topic || /2 || /2 || /2 || /2 || /2 ||
 * Extra work to further explain topic, bubbleshare, pictures etc. || /3 || /3 || /3 || /3 || /3 ||
 * Extra links to math blog sites || **/5** ||  ||   || **Total** || **/50** ||