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8th Math - Pre-Algebra > Test 12 - Final Exam > Flashcards

Test 12 - Final Exam Flashcards

1
Q

542

x786

A

426,012

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2
Q
  1. 4
    - 6.783
A

2.617

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3
Q

15% of $8,000

A

$1,200

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4
Q

2438783 divided by 893

A

2731

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5
Q

3 1/3

  • 2 2/5
A

3 5/15 = 2 20/15

  • 2 6/15 = - 2 6/15
           14/15
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6
Q

4 1/2 divided by 3/8 =

A

9/2 x 8/3 =

3/1 x 4/1 = 12

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7
Q

1 1/4% of $550

A

550 x .0125 = 6.875

round to $6.88

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8
Q

square root of 1,296

A

36

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9
Q

83

A

512

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10
Q

4x + 7 = 23

A

4x + 7 - 7 = 23 - 7

4x = 16

4x/4 = 16/4

x = 4

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11
Q
  • 12
  • (-16)
A

-12

+16

4

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12
Q

3x2y(2xy3)

A

6x3y4

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13
Q

+18 divided by -9

A

-2

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14
Q

16ab3 divided by 4a2b2

A

16ab3 just cancel out

———— =

4a2b2 just cancel out

4b

a

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15
Q

6 g 91 mg

x 8

A

48 g 728 mg

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16
Q

2.5 lb. = ________ kg

A

.45 x 2.5 = 1.125

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17
Q

12 is what % of 20?

A

12 60

—- = —– = 60%

20 100

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18
Q

7 x

– = –

12 15

A

Cross multiply to get 12x = 105. Divide both sides by 12 to get:

12x 105 cancel the 12’s on the left to get x =

—- = —— divide 105 by 12 to get 8.75

12 12 x = 8.75

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19
Q

10 mi. = ______ km

A

1.61 x 10 = 16.1 km

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20
Q

24a2b2c - 36ab3c2

         3ab<sup>2</sup>
A

divide each side of the top equation by the bottom because the top equation cannot be combined. Remember you just divide the numbers & cancel out the letters. If there is a2 on top & a on bottom, 1 a on top cancels with the a on bottom to leave a1 on top that you write as a.

8ac - 12bc2

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21
Q

Multiply (2x + 5) (3x - 2)

A

2x + 5

                         3x -  2

                         \_\_\_\_\_\_

                       - 4x  -  10

             6x<sup>2</sup>  +  15x

            \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

             6x<sup>2</sup>   +  11x  -  10
22
Q

write the formula used to find the length of the hypotenuse in a right triangle.

A

c2 = a2 + b2

23
Q

write 13,000,000,000 using scientific notation.

A

1.3 x 1010

24
Q

find the mean of 240; 317; 188; 439

25
Q

find the area of a rectangle that is 12 ft. x 15 ft.

A

A = lw

A = 12 x 15

A = 180 sq. ft.

26
Q

find the circumference of a circle with a radius of 4 ft.

A

C = 2pir

C = 2 x 3.14 x 4

C = 25.12 ft.

27
Q

find the simple interest on $2,000 for 3 years at 12 1/2 % interest.

A

I = principle x time (years) x interest

I = 2000 x 3 x .125

I = $750

28
Q

find the volume of a cube with 5 ft. edges

A

V = e3

V = 53

V = 125 cu. ft.

29
Q

find the surface area of a cube with 4.1 in. edges

A

SA = 6e2

SA = 6 x 4.12

SA = 6 x 16.81

SA = 100.86 sq. in.

30
Q

find the volume of a cylinder with a raduis of 10 in. and a height of 8 in.

A

V = pir2h

V = 3.14 x 102 x 8

V = 2512 cu. in.

31
Q

write .00009 using scientific notation

32
Q

find the median of 17; 21; 16; 14; 18; 12; 19

A

12, 14, 16, 17, 18, 19, 21

17

33
Q

evaluate 6x + 3xy if x = -2 and y = 6

A

6(-2) + 3(-2)(6)

  • 12 + (-36)
  • 48
34
Q

simplify 4x + 3y + 6x - 4y + 2y

A

4x + 6x + 3y - 4y + 2y

10x +3y - 2y

10x + y

35
Q

find the social security tax on $350 at a rate of 7.65%

A

350 x .0765

$26.78

36
Q

write the number of degrees in a circle

37
Q

write the name of the lines in the same plane that never intersect

38
Q

find the number that is 2 more than 3 times 5

A

2 + 3 x 5

17

39
Q

find the area of a triangle that has a base of 6 ft. and a height of 5 ft.

A

A = 1/2 b h

A = 1/2 x 6 x 5

A = 1/2 x 30

A = 15 sq. ft.

40
Q

find the length of the hypotenuse if the legs are 6 ft. and 8 ft.

A

c2 = a2 + b2

c2 = 62 + 82

c2 = 36 + 64

c2 = 100

c = 10 ft.

41
Q

T or F:

the antecedent is the second term in a ratio.

42
Q

T or F:

A rectangular prism has 6 faces.

43
Q

T or F:

Tax is protection against material loss.

44
Q

T or F:

the length of the radius is one half the length of the diameter.

45
Q

T or F:

A compass is used to measure angles

46
Q

T or F:

An equilateral triangle has three congruent sides

47
Q

T or F:

A circle graph compares the parts to the whole

48
Q

T or F:

A rational number is a nonterminating, nonrepeating number

49
Q

T or F:

A cylinder is a solid shape

50
Q

T or F:

Installment buying is buying on time

8th Math - Pre-Algebra (43 decks)

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