SCRIBE 6

I chose numbers 24 and 27.

24. The first three triangular numbers are 1, 3, and 6.
A) What are the next three triangular numbers?
B) Add together any two consecutive
triangular numbers. What do you notice about the sums?

ANSWERS
A) 10, 15, 21.
B) The sums are all perfect squares.

27. A) Determine the square root of each number: 6400, 640 000,64 000 000.

B) Describe a quick method for determining mentally the square root of each numbe in part a).

C) Explain why this method does notwork for evaluating √640.

D)Use your method in part b) to evaluate √640 000 000 000 . Explain how you determine
the answer.

ANSWERS

27. A) √6400=80
√640000=800
√64000000=8000

B) First, ignore all the zero. Have you noticed that 64 is always there? If so, that means 8 is our first digit for each on of the square root. Why?Because the square root of 64 is 8. Next, pair all the zeros into 2. A pair of zero represents a zero after the 8. That means if there is 3 pairs of zero, then there will be 3 zeros after the eight.

C) The method I used can only work if all zeros have a partner.

D) First I ignore all the zero. I was left with 64.Since I know that the square root of 64 is 8. Then I already know that the first digit of my square root is 8. Next, I paired all the zero. I ended up with 5 pairs. Since I know that there are 5 pairs all I have to do is put them after 8. After all
those steps my answer is 80,000.


VIDEO:)



LINKS!!
How to find a square root without calculator

Scribe 4

Questions 17, 19 ,20

17. The question asks to use prime factorization to figure out if 54 is a perfect square.

Here is the answer.
No. 54 is not a perfect square.

19. This question asks you to find the distince the students ran around the field twice.
This is the answer.

The students ran the distance of 1360 m.

21. The question asks you 3 things.1. That is the area of the patio.

Here is a picture of the patio.

Question 2 asks you to see if you can build another patio with the same area.
Question 3 asks you to make the patio into a square. Is it possible?
The answers
The area of the patio is 56 m2
Two examples for this is 7m by 8m and 28m by 2m.
It is not possible to make the patio into a square. Using prime factorization helps with this.


Here is a video on prime factorization and a link

Nino's, Math Profile

Hi my is Nino. To me math is kind of fun, but even better if the teacher is really funny. I actually like learning math, but not homework since we already have to do lots of work in school. I don't really like doing much work, because I also want to have fun. I really like solving because some of the problems are new to me, and you get learn the ways of it. Elementary was way different and much easier.

Last year, we did integers. It was easy, and we also used chips as an example on how use integers and the tests would be like free marks since it was so easy. I also liked areas of circles and squares, because we did the formulas and they were new to me. But I was kind of struggling on it since there were lots of formulas to remember.

This year I think I will do well on integers, since it's easy, but not on algebra. Algebra was kind of confusing and I did really do well on it last year, but this year i 'm going to try studying on it.

Last year when I was a blogger I got kind of confused on how make one, but the teacher helped me so I finished it on time. Blogging was actually kind of fun, and it felt good doing it for the first time.

Nino's Sesame Street Video

Group Members: Demvry, Nino

Part 1:

Two term ratio : Compares 2 quantities measured in the same units. (a:b)

Three term ratio : Compares 3 quantities measured in the same units. (a:b:c)

Part to part ratio : Compares different parts of a group to each other. (a:b, 2:5)
Part to whole ratio : Compares one part of the group to the whole group. It can be written as a fraction, decimal, & percent. (b:all letters, 5:8)
Rate; Compares 2 quantities measured in different units (2km/2hr)
Proportion reasoning : A relationship that says that 2 rates or ratios are equal. It can be written in fraction form. (2/3 = 6/9. (x3))

Part 2:
The Original Video:

The Martians Discover a Book

Remake:
The Martians and The Math Book

Chris sesame street video

Group :Robin,Justin,L,Chris

Part One :
Ratios:

Two term ratio ; Compares 2 quantities measured in the same units. (Eg A:B)
Three term ratio ; Compares 3 quantities measured in the same units.(Eg A:B:C)
Part to part ratio ; Compares different parts of a group to each other.(Eg A;B 2:4)
Part to whole ratio ; Ccompares one part of the group to the whole group. It can be written as a fraction, decimal, & percent.( A:all letters, 5:11)

Rates:Compares 2 quantities measured in different units.(Eg 4km/2hr)
Unit rate ; A rate where the second rate is 1.(Eg 10 letters/ 2hr)
Unit price ; Used when shopping.(Eg $o35/1mL)

Proportional Reasoning: A relationship that says that 2 rates or ratios are equal. It can be written in fraction form.(2/3 = 6/9. (x3)




remake :

Kaecee's Sesame Street Video

Diana's Math Profle.

Hi, my name is Diana. I'm a math student in grade 8. If someone asked me if I liked math I would say not really. Its not a subject I like doing. I'm not good at it but I like solving some of the problems even if I'm wrong. I remember in grade 6 when we would play a lot of math games & problem solving. I liked doing problems solving with real life problems. Math in grade 6 was way easier to me.


In Grade 7 I really liked learning about mean, median, mode, outlier, and range. The way Mr. Isfeld taught us, I could really remember. I also remember not being good at integers because I was gone while Mr. Isfeld taught the class, and I didn't ask the teacher & students for help.


This is now grade 8. I know that by finishing my homework, I will help me get a better grade in math. I also want to learn more about square numbers and square roots because I find it to be easy. I'm looking forward to doing Algebra in grade 9.


I was a blogger last year. http://room42math09.blogspot.com/2010/06/five-top-for-tests.html this post is about answering test questions also for exams. I like this post because it was really colorful and this was one of the best posts I've done. On this post I got 18 comments, it's not really though. This year, I hope I do a lot more posts and get a lot of comments.