Scribepost for January 7 , 2010 .

Sorry if some other person did this question already , but anyways here you go :)

page 110 .

# 3. Walter walks across a rectangular field in a diagonal line . Maria walks around two sides of the field . They meet at the opposite corner .

a) How far did Maria walk ?
120m + 300m = 420m . Maria walked 420m .

b) How far did Walter walk ? Express your answer to the nearest meter .

a2 + b2 = c2
3002m + 1202m = c2
( 300 x 300 ) + ( 120 x 120 ) = c2
90 000 + 240 = c2
c2 = 90 240 SQUARED .
c2 = 300.3m .

c ) Who walked farther ? By how much ?
Maria walked farther by 119.7 m .



there you go , please comment !

Noel's scribepost , Squares

Question 15
Evaluate:
square root of:
a)49=7
b)64=8
c)652=25.2

2. a) When I use a calculator the square root of a natural number that is a perfect square, I get a perfect number as my answer.

b) When I use a calculator to get the square root of a natural number that is not a perfect square, the answer the calculator gives me has a decimal in it. This is not an exact answer. It is a(n) decimal.

I asked mr harbeck and he said that its ok if you only do 2 questions.

COMMENT

Faye Dscribe

Squares and square roots
Questions.
1&4

pg. 24
1. a whole number that has only two factors, 1 and itself
Prime Number.

4. The product of the same two factors
Perfect Square.

pg. 24-25
7. a) Jamies backyard has an aria of 100m squared. Determine he prime factorization of 100. Show your work.
2x2x5x5= 100

b) Is 100 a perfect square? Explain your thinking.
Yes it is, 10x10=100

pg. 28

2. a) When I use a calculator the square root of a natural number that is a perfect square, I get a perfect number as my answer.

b) When I use a calculator to get the square root of a natural number that is not a perfect square, the answer the calculator gives me has a decimal in it. This is not an exact answer. It is a(n) decimal.

pg. 29
q. 7 ) Martina's painting is on a square canvas with an ara of 45cm squared. She needs to buy a frame for the painting. Estimate the square's side length to one decimal place. Show your work
6.7x6.7= 44.89 = 45cm2

10 ) Aarons parents went to buy an area rug for their 4m x 4m living room. They want space around the rug. The rug itself cannot take up more than 90% of the living room. What is the maximum size of rug they can buy? Show your work.
4m2 9x9=81m2

Argie's Scribepost for December 8th

The three questions i was assigned was 5, 7, and 11, on page 99.

5) Estimate each value, to one decimal place. Check your answer with a calculator.

A) √ 14 B) √ 86 C) √136
My guesses With calculator
5a) 3.6/ 5b) 9.2/ 5c) 11.6 5a) 3.7/ 5b) 9.3/ 5c) 11.7

7) Identify a whole number with a square root between 11 and 12.


I thought the number with a square root between 11 and 12 was 133, because the square root of 133 is 11.5.








11) the square has an area of 20cm squared.

A) Use perfect squares to estimate the side length to one decimal place.
I used two perfect squares with a side length of 4 and a half of a perfect square with a side length of 2.

B) Check your answer using a ruler to measure the side of the square. Measure to the nearest tenth of a centimeter.
When i checked the side length i got 4.5 cm.

three questons from the text book

Question 15
Evaluate:
square root of:
a)49=7
b)64=8
c)652=25.2

To get all those answers, I simply used my calculator.

Question 16
Evaluate:
Square root of:
a)9=3
b)25=5
c)1600=40

Again to get those answers, I used my calculator.

Question 23

A helicopter landing pad has a square shape. The area is 400m squared. Use Prime factorization to fine the side length of the pad.

400

=200 x 2

=100 x 2 x 2

=50 x 2 x 2 x 2

=25 x 2 x 2 x 2 x 2

=5 x 5 x 2 x 2 x 2 x 2

400 = (5x2x2) x (5x2x2)

400 = 20 x 20

400 = 20 squared

Noelle Cuvos's Scribepost For December 8th

Hey Guys I'm one of the few scribers for today, and I was chosen to do 3 questions on page 85. The 3 questions were questions number 15, 16 and 23.

Question 15
Evaluate:
square root of:
a)49=7
b)64=8
c)652=25.2

To get all those answers, I simply used my calculator.

Question 16
Evaluate:
Square root of:
a)9=3
b)25=5
c)1600=40

Again to get those answers, I used my calculator.

Question 23

A helicopter landing pad has a square shape. The area is 400m squared. Use Prime factorization to fine the side length of the pad.

400

=200 x 2

=100 x 2 x 2

=50 x 2 x 2 x 2

=25 x 2 x 2 x 2 x 2

=5 x 5 x 2 x 2 x 2 x 2

400 = (5x2x2) x (5x2x2)

400 = 20 x 20

400 = 20 squared

Simple sentence : The landing pad has a side length of 20 meters.

THANKS , COMMENT !

Scribepost for December 7 , 2009 .

Yesterday we had to do questions from the text book on page 85 questions 1 to 27 .

question # 18

A floor mat for gymnastics is a square with a side length of 14m . What is the area of the floor mat in square meters ?

- The area is 196 m2 .

question # 22

The world's largest city square is Tianamen square in Beijing , China . It has an area of 396 900 m2 .

a) What are the dimensions of the square ?

- 630 m by 630 m / side length .

b) If the square had dimensions of 629 m by 629 m , what would be the area ?

- 395 641 m2

c) If the square had an area less than 394 000 m2 and greater than 386 000 m2 , What are all of the possible whole number dimensions that it could have ?

- 622.0 and 626.0

Celdrick's Scribepost for Dec 4 2009

On Friday we had a one question quiz about estimating square roots and the question was: Estimate the square root 67. This is how you solve the problem.

First: Find the closest perfect square that is before 67 and after 67. It is between 64 and 91. The square root of 64 is 8 and 81 is 9.











Second: Check if its closer to 64 or 81. So now we see that it's close to 64.

Third: Estimate the square root; if 64's square root is 8 then we know that 67's square root is somewhere in 8.1, 8.2, or 8.3.



AND.. This is one question we did from the Home Work Booklet. Pg 28 question 3.