A5 [Chapter

NAME: _____________________________

Grade 8 Mathematics

Midterm Examination

January 2011

Section B

Calculator Permitted

Selected Response

Constructed Response

25 Marks

30 Marks

You will need a pencil/eraser for this section. You are permitted to use a calculator. You are permitted to use any math manipulatives that your teacher has used with you this year.

Questions 1-25 (multiple choice): These are worth 1 mark each. Place the letter, corresponding to the best response, in the space provide on the next page.

Even though you have to choose an answer, you may have to work things out on scrap paper.

Questions 26-38 (constructed response): Answers are to be done in the spaces provided. Students are reminded to show all steps/calculations since credit may be given for incomplete or partially correct solutions. Numerical answers without workings/explanation will not merit full credit.

ANSWER SHEET

Grade 8 Mathematics

Stephenville Middle School

January 2011

Name ______________

Section B: Calculator

1.

A

11.

D

21.

B

2.

C

12.

C

22.

A

3.

C

13.

C

23.

A

4.

B

14.

A

24.

C

5.

D

15.

A

25.

D

6.

A

16.

C

7.

C

17.

B

8.

C

18.

A

9.

C

19.

C

10.

A

20.

C

( / 25 Marks / 30 Marks / 55 Marks / 25 / 55 ) (Teacher Use Only)

Selected Response:/30 Marks

Constructed Response:/30 Marks

Total:/60 Marks

Section A

Section B

Exam Total

Percentage

/20

/60

/80

/100

Selected Response [30 Marks]

Place the letter for the best answer in the space provided on the ANSWER SHEET

(A B C D)1. Which point on the number line below represents the best approximation for ?

A) A

B) B

C) C

D) D

2.Which triangle can be proven to be a right triangle?

A)

B)

C)

D)

3.Find the value of x to the nearest tenth of a centimetre?

(6 cm)

( x)

(12 cm)

A) 3.5cm

B) 6.0cm

C) 10.4 cm

D) 13.4 cm

4. What is the square root of 10000?

A) 10

B) 100

C) 1000

D) 10000

5. LCD televisions are priced according to the length of the diagonal of the screen. To the nearest hundredth of a centimetre, what is the length of the diagonal of the screen shown?

A) 14.83 cm

B) 30.0 cm

(40 cm)

C) 57.45 cm

(70 cm)

D) 80.62 cm

6. Which of the following statements is TRUE ?

A) is between 5 and 6.

B) is equal to .

C) is equal to 6.

D) is between 49 and 51.

7. Evaluate :

A)8

B) 32

C) 64

D) 4096

8. If the distance between two dots is 1unit, what is the length of the line segment?

A)

B)

C)

D)

9. In the diagram the triangle is a right triangle. What is the value of x?

A) 6 cm2

B) cm2

C) 36 cm2

D) 164 cm2

(64 cm2)

10. Calculate:

A)

B)

C) 6

D) 18

11.Which of the following will result in the largest answer?

A) 20048 + 358

B) 20048 358

C) + 20048 358

D) 20048 358

12. A submarine was at the surface of the ocean. It descended in four equal drops to a final depth of 108m below sea level. What was the depth of each drop?

A)

B)

C)

D)27

13.One night, the temperature fell 4C every 30 minutes for a total of -24C. What is the total number of hours over which this temperature change took place?

A)

B)

C) 3

D) 6

14. Which integer multiplication does this number line represent?

A)

B)

C)

D)

15. Find the mean temperature of : .

A)

B)

C)

D)

16. Which multiplication expression is related to this division expression?

A)

B)

C)

D)

17. Using benchmarks what is the best estimate for ?

A) 0

B)

C)

D)

18. There is of a pizza in a box. Four people want to share it. What fraction of a pizza will each person receive?

A)

B)

C) 3

D)

19. Sally ate of a pizza. Joe ate . Who ate more and by how much?

A)Joe; by

B)Joe; by

C)Sally; by

D)Sally; by

20. Which object is formed with this net?

A) triangular pyramid

B) rectangular prism

C) rectangular pyramid

D) regular prism

21. Which of the following is a net for a TRIANGULAR PRISM?

A) Net A

B) Net B

C) Net C

D) Net D

22. What is the area of the label on the can?

(10 cm)

(11 cm) (Use = 3.14)

A) 345.4 cm2

B) 690.8 cm2

C) 865.5 cm2

D) 3454 690.8 cm2

23.Chris bought a new fish tank as shown below. The bottom of the tank is made of plastic. How much glass was used to make the tank?

A) 1224 cm2

B) 1446 cm2

C) 1704 cm2

D) 4320 cm2

24. If each edge of a cube is 7 cm, what is the surface area?

A) 21 cm2

B) 42 cm2

C) 294 cm2

D) 343 cm2

25. Identify the faces in this 3 - D object

A)Three different rectangles and two different triangles

B) Three congruent rectangles and two different triangles

C) Three congruent rectangles and two congruent triangles

D) Three different rectangles and two congruent triangles

NAME: __________________________________________________

Section B: Constructed Response [30 Marks]

Write your answers in the spaces provided, and show all workings to achieve full marks.

26. Sally has a square vegetable garden. The area of the garden is 81m2. How much fencing will she need to enclose the garden?

{3}

Fencing = perimeter = 4 x side = 4 x 9 = 36 m

27. A group of kids built their own baseball field (square) in a small vacant field.

The distance between the bases is 20 m. Jim Teacher can throw the ball 30 m.

Can he throw the ball from home plate to second base in one throw?

{4}

Hypotenuse = second base to home plate

a2 + b2 = c2

202 + 202 = c2

400 + 400 = c2

800 = c2

800 = c

28.3 m = c

The distance from home to second base

is 28.3 m. Teacher Jim can through 30 m

so he will make the throw.

28. You are competing in a contest to win a trip to Florida. Answer the skill testing question, shown below, to claim your prize.

Grade 8 Math Final ExamJune 2009 Page | 1

Grade 8 Math Final ExamJune 2009 Page | 4

Grade 8 Math Midterm Exam (Section B)January 2011 Page | 5

{3}

( -1(-1)( 10 ) ( +2 ) + [ ( -7 ) - ( -3) ] ( - 6 )

((-1)( 10 ) ( +2 ) + [ ( -7 ) - ( -3) ] ( - 6 )(-1)( 10 ) ( +2 ) + [ ( -7 ) + ( +3) ] ( - 6 )(-1)( 10 ) ( +2 ) + (-4) ( - 6 )(-1)( 10 ) ( +2 ) + (-4) ( - 6 )(-10) ( +2 ) + (-4) ( - 6 )(-10) ( +2 ) + (-4) ( - 6 )(-5) + (-4) ( - 6 )(-5) + (-4) ( - 6 )(-5) + (+24)+19)

29. Phineas owes $240 to his brother Ferb. He pays the money back in $8 monthly payments.

A) Write this situation as a division expression using integers.

B) Use the expression to find the number of months it took for Phineas to pay back Ferb.

(A) (-240) (- 8) B) (-240) (- 8) = +30It will take 30 months to pay back the money){2}

30. In the video game CRAZY CLOWNS you throw pies at a clowns face. You receive 20 points if you hit the clown in the face. If you miss the clowns face you lose 10 points. You begin the game with 100 points. During the game you hit the clown 4 times and missed him 13 times. Use an expression to find your final score.

(100 + (4) ( 20) - (13) ( 10 )100 + 80 - (13) ( 10 )100 + 80 - 130180 -13050){2}

31. Simplify. Show all workings.

{2}

32. Calculate:

{3}

33. Red Green has of duct tape. It takes of duct tape to make a wallet. How many wallets can he make?

{2}

34. Marcie has a tub of building blocks. Two-thirds of them are red. One-fourth of the red ones are cylinders. What fraction of the tub of blocks are red and cylinders?

{2}

35. Calculate the total surface area of the solid figure below.

(Triangle 1 area = ( 6 x 12) / 2 = 72/2 = 36 Triangle 2 area = ( 6 x 12) / 2 = 72/2 = 36Rectangle 1 area = 6 x 20 = 120Rectangle 2 area = 12.4 x 20 = 248Rectangle 3area = 12.4 x 20 = 248Total = 36 + 36 + 120 + 248 + 248 = 688 cm2)

{3}

36. A large cylindrical oil tank has a radius of 13m and a height of 15m.

A) Find the exposed surface area.

B)If a large can of paint can cover 126m2, how many cans of paint are needed to paint the tank.

(A) S.A. = 1 circle + rectangle S.A. = r2 + dh S.A. = (3.14)(13)2 + (3.14)(26) (15) S.A. = 530.7 + 1224.6 S.A. = 1755.3 m2B) # cans of paint = 1755.3 126 = 13.9 = 14 cans of paint){4}

14 cm

7 cm

x

1

20 cm

12.4 cm

6 cm

12 cm