841Leslie+D

Welcome to my grade eight digital portfolio. This is what we have done in grade eight so far. There are explanations and questions you get to anwser.


 * __Mean Median and Mode__**


 * the set of numbers must be in numerical order*

Mean- when all the numbers are added up then diveided by the number of the total amount of numbers there are.

Median- the middle number in the set of numbers.

Mode- a number that is repeated twice or more in the set of numbers.

Example 9,2,2,6,5,2,4 2,2,2,4,5,6,9

Mean-4.28 2+2+2+4+5+6+9=30 30/7=4.28

Median-4

Mode-2 There are three two's.

8,4,3,3,5,7
__Your Answer:__

3,3,4,5,7,8

Mean-4.1666

Median-4.5

Mode-3

841ldanswers


 * __Square Roots__**

Perfect Square- any square that has the same whole number for all four sides.

Square Root- a number times itself.

Example Square Root of 15 3x3 4x4 9,10,11,12,13,14,15,16 1 2 3 4 5 6 7 16-9=7 Square Root of 15 is 3 6/7ths

Without using a calculator find the square root of 45.
__Your Answer:__

6 4/13

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__**Percent**__

Percent- it is an equivalent that is written as a fraction out of 100.

__Question:__ 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?

__Your Answer:__

no because you 1.5 % less

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 * __Ratio Proportion__**

1.Please solve with __Fractions.__ Example: If Tom has one tie for every ten shirts how many ties does he have if he has 30 shirts? P/T equals 1/10 equals __**3**__/30

30/10=3 1x3=3

On a recent trip Mya drove at an average speed of 110 km/hr, How long would it take her to travel 800 km?
__Your Answer:__

7hours 10.8 minutes

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2.Please solve with __Ratio Tables.__

Example of tables:



What is the missing length of the rectangle.


__Your Answer:

?

841ldanswers__

Blogger!!!

This is a scribe ( explain what we did in math that day.) -http://841math.blogspot.com/2007/01/january-11ths-scribe.html

This is a growing post (a post made and we add questions to it and answer them. -http://841math.blogspot.com/2006/12/leslies-percentage-growing-post.html