873 Math Blog

Here is the Scribe List for 873. Please select a classmate who is responsible to be the scribe from this list. Be sure to ask a person who has not been chosen yet in the current scribe round.

Scribe List
Zerlina November 5 January 20
Justin A January 7
Francis December 15
Azra January 23
Elmane November 14
Shaneille November 6
Myles
Angela November 12 January 23
Melanie November 4 January 22
Aaron
Aleiah November 3 January 19
Christian November 25
Kareel January 12
Any November 18
Lance November 19
Shannon
Kara December 1 January 21
Gerico January 8
Monique
Kristin November 13
Brendan January 6
Justin P December 12
Andrew December 9
Leomar December 11
Carlos December 17
Simran November 10
Vikram January 12
Alwin December 16
Darren January 13
Chie November 19
Sebastian January 13
Bea December 2
Louise November 26
Shaine January 5

Today we had to do a few problems from the green booklet. We have to do questions that are similar to the questions from Part 3 (which coincidentally is our homework).

The difference in these questions are that you'll need to do BEDMAS.

For example, if you take question... I don't know... 13.

13. (17-25) - (-8+7) - (-15+25)


First Step: Do the INSIDE of the brackets.



13. (17-25) - (-8+7) - (-15+25)
-8 -1 10

Second Step:Keep the brackets

13. (17-25) - (-8+7) - (-15+25)
(-8) (-1) (10)

Third Step: Pull down order of operations sign

13. (17-25) - (-8+7) - (-15+25)
(-8) - (-1) - (10)

Fourth Step: Look for "uh-oh"s (and turn them into have have)

13. (17-25) - (-8+7) - (-15+25)
(-8) + (+1) - (10)

Fifth Step: Rewrite (and look for shortcuts like zero pairs because we're "lazy teenagers")

13. (17-25) - (-8+7) - (-15+25)
(-8) + (+1) - (10)
-8+1-10



Sixth Step: Combine like integers

13. (17-25) - (-8+7) - (-15+25)
(-8) + (+1) - (10)
-8+1-10
-18+1 =+17


10. -(-2+8) + (-3-4)

3. (-2+4) - (-4+2)=

( 2 ) - ( -2 )

(2) + (+2)

2+2=4

Homework

1. Part 2. odd numbers only (if you haven't done them already)

2. Part 3. All of it.

I pick Melanie to do the next scribe.

more about integers

rises 3 degree drop 2 degree = left 1degree

have 50 books give a friend 10 books = left 40 books

now I want to talk about time line, how can we add integers in time line

(+2) + (+1) = (+3) in time line

Standard Form:

ex. 7 + 8 + 5 = 20 9 + 8 - 4 = 13

Standard form is when you write down numbers without the brackets. (also gr. 7 form) And you just write it down the way you usually write it down. Like 5 + 5 = 10 or 10 - 4 = 6

ex. with brackets- (7) + (8) + (5) = 20 (9) + (8) + (-4) = (13)

Bracket form is when you write down brackets around your numbers, and when subtracting, you write down a minus sign beside the subtracting number.

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

One day, in a small town, lived a girl. She had 2 cats. But one day, one of the cats ran away. The girl was very worried when she found him missing. So she went out to find him. It was a very nice day, and the girl looked up in the sky. She noticed a little pattern in the sky with the clouds. She could not tell what it was, so she tried climbing up a tree to get closer. But the tree was too high. Trying to measure it in her mind, she heard a meowing sound. It was her cat! She wanted to get to him, but he was very high up. So again she estimated how long it was. She thought it was about 6.4 feet tall. Her cat tried to come down, but it could not. So the girl started to climb up. She was lucky that there were lots of little branches to put her feet on. They even looked like they were almost perfectly lined up. There were about 18 of them. The girl went up 5, but then she dropped her bag. So she had to go down 5 to get it.

0 + 5 = 5 5 + (-5) = 0

Once she got it, she went up 8 branches. Then up 6 more.

0 + 8 = 8 8 + 6 = 14

She was almost there! But then her cat went down 5. Then back up one because he got scared.

18 + (-5) = 13 13 + 1 = 14

They were on the same branch. The girl grabbed her cat, and climbed down all branches.

14 + (-14) = 0

Then when the girl looked up in the sky again, the pattern was a lot more clear now. They were numbers. And they said:

0 + 5 = 5 5 + (-5) = 0 0 + 8 = 8 8 + 6 = 14 18 + (-5) = 13

13 + 1 = 14

At first the girl did not get it, but then she realized: she just did integers math! When she got home, her cat never ran away again.

The End

Today in class Mr.Harbeck gave us a green booklet,and we tackled about adding and subtracting integers in standard form. For our homework Mr.Harbeck assigned us to do the part 1 (1-20) and part 2 (even numbers only).


In some cases in the part 2 , you should re-write the question first and then add the opposites
and you must also have to remove the "diapers" or parenthesis or something like Mr.Harbeck said...

e.g.
1.) 8 - (-7) + 3 - (-5) = ?
have8 owe owe7 have3 owe owe5 = ?
8 + 7 + 3 + 5 = 23
have8 have7 have3 have5 = have23

but in part 2 you only have to do the even numbers.....

2.) 5 - (-8) - (7) + 5 = 25

4) 5 - 2 - (-7) - (-3) = 13

6) -7 - (-5) - (-7) - 8 = -3

8) -7 - (-5) - (5) + 8 = 11

10) - (-2) - (-6) - 15 = -7

12) -2 - 3 + 4 - 6 = -7

14) 2 - 7 - 8 = -13

16) 3 - 8 + 9 = 2

18) - 20+ (-8) - 4 - (-10) = -6

20) -100 - (-100) + 50 - (-50) = 100

22) -10- (-10) -1 =1

24) - (-5) + 9 - 20 = -6