## Thursday, March 25, 2010

### Deniel's surface area growing post

### Surface Area Growing Post

## Wednesday, March 24, 2010

### Nhea's Growing Post 3/24/10

B)To get the answer to this Question -

All you have to do is multiply the first number (4) by the numerator (1) but the demoniator always stays the same so you would get the answer (4/2) then you have to simplify if possible (1 2/2).

C)To Answer this question -All you have to do is use a picture (or number line) to determine the answer. Using a picture all you have to do is make a square. The number of squares going down is the same number as the single number (2) and the squares going across is the same number as the first denominator (4). Then shade in the the number of the single number (2) and use a different colour to shade in the number of the numerator (1) over the already shaded part to get your answer (1/8)

D) To answer this question -

All you have to do is shade in the number of squares that match the single number, 5, then use a different colour to re-shade the number that is the numerator, 1. Then you would get 1/15 as your answer.

Part 2

Fractions

### Althea's Fraction Growing post

page 202, question 6

a.) 4 x 1/2

b.) 3 x 7/10

c.)5 x 2/3

this is a different way to solve the problem

5/1 x 2/3

so i mutiplied numerator which is 5 x 2= 10

then i multiplied the dinominator which is 1 x 3= 3

10/3

10 divided by 3 = 3 1/3

d.) 3 x 3/8

3 x 3= 9

1 x 8= 8

9/8.....9 divided by 8= 1 1/8

page 208 question 5

a) 3/5 dvided by 2

b.) 1/5 divided by 3

c.) 1/2 divided by 4

d.) 2/3 divided by 6

page 208, question 7 (word problem)

____________________________________

Part 2

Part 3

Explain:

1 1/2 divided by 3/4

• Find the lowest common denominator (LCD).

•Lowest common denominator of 2 and 4 is 4

•The answer is 2

___________________________________________________________

3/4 divided by 1/2

•Find the LCD ( lowest common denominator)

•LCD of 4 and 2 is 4

1 x 2=2

2x2=4

Now, we have to know how many 2/4 goes into 3/4.

•the answer is 1 1/2

Thanks for Reading!!

### Fraction Growing Post

Proper Fractions

Questions through 3-11

3.

a) 5/6 x 1/2 = 5/12 b) 3/4x 5/6 = 15/24.

The step is to multiply the numerator and the denominator.

7. Tamar had 1/2 of an apple pie in her refridgerator. She ate 1/4 of this pie.

**1/2 x 1/4 = 1/8 8. 1/3 x 1/4 = 1/12 9. 1/20 x 1/10= 1/200 ****10. 3/5 x 1/2 =3/10 11. 6/7 x 7/18 =42/126**

### Monica's Growing Post

lxw

12x4.5

54x2

=108

side

lxw

10.4x4.5

46.8x2

lxw

12x10.4

124.8x2

=249.6

TSA:108+93.6+249=451.6 cm2

bxh/2

8x7/2

56/2

=28

lxw

10.6x2.5

=26.5

lxw

2.5x7

=17.5

lxw

8x2.5

=20

tsa: 28+28+26.5+17.5+20=120cm2

r=d/2

r=9.5/2

r=4.75

2*3.14*r*r

2x3.14x4.75x4.75

=141.70

3.14xdxh

3.14x9.5x11

=328.13

tsa:140.70+328.13= 469.82 m2

## Sunday, March 21, 2010

### Jusitn's Surface Area Growing Post

**TSA of rectangular prism**

The rectangular prism has rectangular faces.

So, use the formula *A* = *lw* to find the area of the faces.

For both the front and back faces, *l* = 5 in. and *w* = 2 in.

So, the area of the front and back faces is,

5 2 2 = 20 in.^{2}

For both the top and bottom faces, *l* = 14 in. and *w* = 5 in.

So, the area of the top and bottom faces is,

14 5 2 = 140 in.^{2}

For both the sides, *l* = 14 in. and *w* = 2 in.

So, the area of the two sides is,

14 2 2 = 56 in.^{2}

Add the area of the faces.

20 + 140 + 56 = 216

So, the total surface area of the given solid is 216 in.^{2}.**TSA of triangular prism**

The triangular prism has triangular bases.

So, to find the area of the bases, use the formula:

Substitute 6 for *b* and 8 for *h*.

Therefore, the area of the two bases is,

2(24) = 48 cm^{2}

The triangular prism has rectangular sides.

So, use the formula *A* = *lw* to find the area of the sides.

The area of the front side is,

13 8 = 104 cm^{2}

The area of the bottom side is,

13 10 = 130 cm^{2}

The area of the back side is,

13 6 = 78 cm^{2}

Find the sum of the base areas and the area of the sides.

48 + 104 + 130 + 78 = 360

So, the total surface area of the given solid is 360 cm^{2}.**TSA of a cylinder**

The radius of the circular base is,

he area of a circle is, *A* = *π**r*^{2} where *r* is the radius.

Replace *π* with 3.14, *r* with 2.4.

*A* (3.14)(2.4)^{2}

*A* = 18.0864

So, the area of one base is 18.0864 cm^{2}.

The sum of the areas of the two bases is,

18.0864 + 18.0864 = 36.1728 cm^{2}

This video is on how to find the tsa of a cylinder , rectangular prism, and triangular prism. It was created by Warren, Bruce and I.