873 Math Blog

Adding and Subtracting Fractions

• Find the Common Denominator
  

• Add the numerator

5/7 + 1/2

10/14 + 7/14 = 17/14 14 divided of 17 = 1 3/14

3 + 2/7

3 x 7 + 2 = 21 +2 = 23/7

• Always the same denominator
• Subtract Numerator

2/3 - 5/12

8/12 - 5/12 =3/12 =1/2

Multiplying Fractions

• Multiply the numerators
• Multiply the denominator

3/4 x 2/6 = 6/24 = 1/4

Changed mixed fraction to an improper
multiply the numerators and denominators

8 1/2 x 11 1/3

8 x 2 + 1 = 17 3 x 11 +1 = 34

17 / 2 x 24/3 = 578/6

6 divided 578 = 93

Dividing Fractions

• Find the reciprocal
  
• Multiply the numerator to numerator
  
• Multiply the denominator to denominator
• Convert the fraction into a mixed fraction
• Simplify

1/4 Divided 1/8 = 2

1/4 x 8/1 = 8/4 8/4 = 2

____________

1/8 x 8/1 = 1


2 divided 1/2 = 4

Word Problem

It takes 2 1/4 scoops of flour to make one cake.How many cakes do 15 scoops of flour make ?

15 divided 2 1/4

2 x 4 + 1 = 9 5 divided by 9 / 4

15 /1 x 4/9 = 6 2/3

_________________



4/9 x 9/4 = 1

1 - cakes do 15 scoops of flour make .

The Pythagorean Theorem is the homework that were doing a week ago.
Pythagoras is the first person to do the vegetarian that means that you only eat vegetables.Pythagoras is a greek mathematician.He thought that harmatic frequencies and the sound could heal the sick.Pythagoras is the first person to invent that sound is a medicine.

Words that you have to remember:

• Hypotenuse is the longest side of a triangle which is C
• Legs are the sides of the triangle that have 90 deegrees
• R.A.T. means Right Angle Triangle
• Pythagoras is a greek it means he lived in Greece

Before winter break we've watched the movie "Pay it Forward".There's a task that we have to do and that is to do something that you can say pay it forward.In the movie there was a boy that believe that one person can make big difference.In this assignment we have to have act of kindness.In order to solve that we have some couple of question that we have to answer:



1.Who are you going help?
2.What are you going to do?
3.When are you going to do this?

During the break i want to give my family a little help.For the first time i will woke up 5:30 even though i've sleep in 2:00 in the morning.I will do lots of things in our house to pay my parents forward for what they do to us every day.I've started in 5:40 and clean up the living room and the washroom. Then 8:00 i was the dishes and make our breakfast.Ive wash the dishes once again and take a bath because have a practice in 11:00 to 12:30.After my mom picked me in school i shovel snow and clean our car.I'm kind a tired and i started to sleep but i have to do somethingelse to help my parents but my mom said thank you.And i was like so sleepy and i fall down on the bed and started to rest.I enjoyed time doing those things.I feel great that i do a little help for my parents.Showing kindness can really make a Big difference.

Today in class we did fill out our yellow barn door.Mr Harbeck give as some question and we try to answer it in Algebra tiles.




Here are some example of what we did today:


2n = 10
2n=10


2n = 10
2 2

n = 5

2n = 10

2 (5)= 10

10=10

Using Algebra Tiles

2n = 10













Sorry for the Mistakes")
For the next scribe i choose Sebastian

Mean-the sum of all data divided into the number of data.

Example:
2,4,5,6,7,8,=32

32 divided by 6=mean:5

Median-the middle number
-if you have 2 middle number find the average

Example:
4,8,2,9,6=2 is the middle number


Mode-most common number

6,4,1,3,2,9,8,8=8 is the mode


8-is the most common number

Range-largest data minus smallest data

Example:6,8,4,9,2,7

2 is the smallest
9-is the biggest

So,9-2 =7 is the range

Todays class is about adding and subtracting integers in standard form.For example 1 + 2 your just gonna add it that gives you 3.It is not the thing that were doing in the test.You read it like this have 1 have 2 never put and.=]

Part 1

1.6+8=14
2.-4-3=7
3.15-2=13
4.14+8=22
5.9-23=14
6.-5-8=13
7.-11+12=1
8.22-8=14
9.-7-8=-15
10.-7-8=-15
11.-4+4=0
12.-8-9=-17
13.6-9=-3
14.11-(8)=3
15.5-12=-7
16.-8+3=-5
17.6+3-12-1=-16
18.1+18-7+=12
19.8+5-7=10
20.-10-3+8-2=-7

Once upon a time there were lots of sports car in the Gerico's sport cars bit the problem is lots of the cars are not moving at all either you put a gas oil or anything the car move .Gerico have 18,481 sports car in his shop,one minute later their was a guy named carlos and try to have a deal on the yellow 2009 chevrolet corvett that cost 50,000 dollars.Carlos react he said how about 25,000 dollars gerico said 'oh common ',thats so cheap man,and maybe i can give you chevrolet malibu.Carlos thinks what the good deal is.Carlos wants the corvett and they have a deal of 49,000 dollars and a additional of teaching him to add and subtract integers every week.

[photo]


Carlos go back on Gerico's shop and completing a deal of 49,000 dollars with an additional of teaching lessons for one year carlos go to gerico's office having apen and a paper on his hand
gerico's first question was, whats the sign for negative.You put like a minus sign on it.How do you know it though?because Mr.Harbeck teach me that thing yesterday.


I'm going to give you an example of adding negative integers and yry to answer it by your self Gerico'said.


-2 + -9= -11

-5 + -8 = -13

-13 + -7 = -20

You are right carlos good job!but can you explain it to me how did you get those answers Gerico 'said.
For example the first question they have the same sign and you just have to add it negative 2 plus negative 9 gives you negative 11.

Carlos you really did a good job!keep up the good work.The contract between gerico and carlos have been settled done carlos have left driving a brand new sports car and a lesson that he will never forgot.

[photo]

Few minutes later a guy come and looking for a truck his name was justin.Justin is looking to have a deal with the white chevy silverado and a package of teaching him how to add positive integers justin have a deal with gerico and the lesson will start tommorow morning.

On the following day justin came back to the shop .Justin walks through gerico's office.What do you put for the positive sign?Give ma 2 ways how to do it.

For example 18 you can just simply put 18 and another thing is you will put plus sign before the number.

How do you know this things justin?gerico said.when i was in grade 7 Mr. Isfeld teach me those.
So' i will give you an example and try to answer it.

+2 + +9 = +11

+17 + +5 = +22

+29 + + +16 = +45

Your work i well done justin!thank you justin said.


One week after the deal carlos and justin go back to gerico's shop and complaining about their cars.Justin said why is my truck not starting.I don't know maybe there's a code on it.What's the code the two guys said maybe its the lesson that i teach you guys gerico said.What is it?carlos says.The only lesson that we don't study is the meaning of integers justin said.Your right justin we can solve that problem if you guys know what integers mean.Justin and carlos ask gerico if he knows what does Integer means.Carlos and justin have no idea what integer is.The only man that can solve it is gerico because he's good in math.I got it he shouts ''Integer are the set of numbers consisting the natural numbers including positives 0,1,2,3......and their negatives-0,-1,-2,-3 etc.The two cars started to start and move carlos and justin are so thankful to gerico,first the car and the most important one learning about integers.