Notes for June 1st, 2011

equation- mathematical statement with two expressions that have the same value.
eg. x+2=3 y-7=(-4) 3a-2=a+2 b=4


model: 8 times a number plus 4 is 12. 8n+4=12

Identify the constant, variable, and numerical coefficient.

opposite operation:

addition, subtraction
subtraction, addition
multiplication, division
division, multiplication

Problem #1:




Problem #2:




Link to an AMAZING game:

http://www.math-play.com/Algebraic-Expressions-Millionaire/algebraic-expressions-millionaire.html

AWESOME algebra music video:

Answering Marnelle's Question

Marnelle's question is...

• What is the p(white) marble? Express as fraction, ratio and percent.

Answer: 4/8 (1/2),
4:8 (1:2),
50%

Question For Rm. 7-09

Hello Room 7-09! Here is my question for you.

• What is the probability of spinning a green on this spinner? Please express as a fraction, ratio and a percent.
  

You can practice doing probability on this site: http://jmathpage.com/JIMSProbabilitypage.html

Here is also a video on probability. (Shaq's shots and misses)

Probability and Odds in Math from Tyler Stubenhofer on Vimeo.

Good Luck! I hope you understand the question.

Probability Continued (Jan. 19, 2011)

Organizing Outcomes
First way: chart or table

Independent Events- the outcome of one event that has no effect on the outcome of another event.

Sample Space- all possible outcomes of an experiment.

Question from class:
a)

b) How many outcomes are there? Answer: 12

Second way to organize outcomes:

Tree Diagram- a diagram used to organize outcomes. It contains a branch for each possible outcome of an event.

eg.)





Website: http://www.ixl.com/math/practice/grade-7-probability-of-opposite-mutually-exclusive-and-overlapping-events


Video:

Probability Jan. 17, 2011

Probability-the likelihood or chance of an event occuring (something happening).
Probability is favourable outcomes over possible outcomes.

• Probability can be expressed as a fraction, ratio, or percent.

• Favourable Outcome is a successful resort in a probability experiment.

• Possible Outcome is one possible result of a probability experiment.

• p(6) is a way to say probability of rolling a 6 on a die.

Objects that can show probability.






Here's a site.
http://www.ixl.com/math/practice/grade-7-probability-of-simple-events




Here is a video about kids playing probability games!

Create your own B.E.D.M.A.S. Question

Mr. Isfeld told us to make our own B.E.D.M.A.S. question using the numbers 1-9 and all the operations in B.E.D.M.A.S. The answer also has to be 7.

Here is my question.

I didn't put any link and video because Mr. Isfeld told us to only put our question and answer.


Sorry the picture was small. I didn't know it would be smaller when I put it here.


Anyways, I hope you understand!

Solution to the 3 Questions

1.) Annie has been asked to calculate 1.7 + 6 / 2. She claims the answer is 3.85. Do you agree? Explain why or why not?
Answer: No. She is wrong. Here is my solution.


2.) Put brackets in the following expression to get the largest value possible. What problem solving strategy did you use? 3 x 2.8 + 6.4 /(divide) 4

a.)

a.)step1: I put brackets in 3 x 2.8.
step2: I multiplied it and got the answer 8.4.
step3: I brought all the other expressions down.
step4: I divided 6.4 / 4 and got the answer 1.6.
step5: Then I brought all the other expressions down.
step6: I added 8.4 and 1.6 and got the answer 10.

b.)




b.) step1: I put brackets in 2.8 + 6.4.
step2: I added it and got the answer 9.2.
step3: I brought all the other expressions down.
step4: I multiplied 3 x 9.2 and got the answer 27.6
step5: Then I brought all the other expressions down.
step6: I divided 27.6 / 4 and got the answer 6.9.

c.)


c.) step1: I put brackets in 6.4 / 4.
step2: I divided it and got the answer 1.6.
step3: I brought all the other expressions down.
step4: I multiplied 3 x 2.8 and got the answer 8.4.
step5: Then I brought all the other expressions down.
step6: I added 8.4 and 1.6 and got the answer 10.

Which has the largest value?
a.) 10 | b.) 6.9 | c.) 10
Answer: a and c has the same answer. Both of them also have the largest value.



3.) Create a problem that could be solved using the following expression. 2.5 + 1.25 + 5 x 1.6.

Problem:
Joe wants to know what the answer to 2.5 + 1.25 + 5 x 1.6 is. He estimated 42.98. Do you agree? Explain why or why not?

Answer: No. He is wrong. Here is the right answer.



Order of Operation:
Example #2 from class

6 - 2 / 2=
\/
6 - 1=
\/
5

Here is a link to help you.
http://www.funbrain.com/algebra/index.html

Here is a video of a class singing about the Order of Operation. They call it Pemdas instead of Bedmas, but I think it's the same thing. Enjoy!




I hope you understood!

Corrections for Number 5

A coordinate grid has the following set of ordered pairs: (-2,-5), (0,-4), (3,0), (4,1), (5,2), (6,3). The point (0,-4) is out of place. True or False?

True. All the ordered pairs are plotted straightly except for point (0,-4).

Here is a picture of a coordinate grid to help you.





This link will take you to a fun math site where you can practice plotting an ordered pair.
http://www.funbrain.com/co/index.html


Video of plotting an ordered pair.


I hope it helps you!