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7th math > Test 12, Units 1 - 15 > Flashcards

Test 12, Units 1 - 15 Flashcards

1
Q

T or F: The hypotenuse is the longest side in a right triangle.

A

true

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2
Q

T or F: The absolute value of -8 is 8

A

true

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3
Q

An isosceles triangle has ____ congruent sides.

A

isosceles has 2 congruent sides

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4
Q

The cosine is the ratio between the length of the _______ leg to the length of the hypotenuse.

A

adjacent

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5
Q

The boiling point of water is _____ degrees C.

A

100

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6
Q

The expression 28xyz has how many terms?

A

one, it is monomial

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7
Q

T or F: Shapes that have the same size & shape are said to be similar

A

False

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8
Q

T or F: The points where the sides of a polygon meet are called the vertexes.

A

true

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9
Q

T or F: A heptagon is a seven-sided polygon

A

true

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10
Q

T or F: An acute angle has more than 90 degrees but less than 180 degrees.

A

False. Obtuse.

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11
Q

Write the formula for finding the area of a triangle

A

A = 1/2bh

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12
Q

Write the simple interest formula

A

i = prt

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13
Q

Write the formula for finding the circumference of a circle using the diameter

A

C = pid

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14
Q

Write the formula for finding the volume of a cylinder.

A

V = pir2h

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15
Q

Write the formula for finding the perimeter of a square

A

P = 4s

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16
Q

Convert 120 miles to the nearest whole kilometer. Remember that 1 mi. = 1.61 km

A

120 x 1.61 =

193 km

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17
Q

Convert 45 degrees C to the Fahrenheit scale.

A

9/5C + 32 = F

9/5 x 45 + 32 = F

81 + 32 = F

113 = F

113 degrees F.

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18
Q

Find the approximate number of miles 23 North latitude is from the equator. Remember that the distance between 1 degree of latitude is approximately 69 miles.

A

23 x 69 =

1587 mi.

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19
Q

Write the time in the Central Zone if the time in the Pacific Zone is 11:35 P.M.

A

Difference is +2 hours, so:

1:35 A.M.

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20
Q

Write the number of centimeters in 3.5 meters.

A

100 centimeters in a meter so:

3.5 x 100 =

350 cm

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21
Q

Write the number of inches needed to represent 25 miles on a map if 1/2 inch represents 50 miles.

A

25/50 = .5 or 1/2, so 1/2 inch x 1/2 =

1/4 in.

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22
Q

Write the number of ounces in 3 1/2 pounds.

A

16 oz. in a lb., so 3 1/2 x 16 =

56 oz.

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23
Q

Round off 0.579 to the nearest hundredth.

A

0.58

24
Q

Write the number of degrees in a right angle.

A

90

25
Q

Write the value of x in

5/8 = x/16

A

x = 10

26
Q

Write the length of the radius if the diameter is 6 cm.

A

3 cm

27
Q

Write the sum of -6 and -8.

A

-14

28
Q

change 34/5 to a mixed number

A

6 4/5

29
Q

Express 1/4% as a decimal.

A

.0025

30
Q

4732

-1586

_______

A

3146

31
Q

486

x509

______

A

247,374

32
Q
  1. 43
    1. 097

+6.54

_________

A

16.067

33
Q

.504

x .007

_______

A

.003528

34
Q

16 2/3

  • 7 4/5

_________

A

8 13/15

35
Q

15 7/8

9 1/2

+ 6 1/3

_________

A

31 17/24

36
Q

9 3/8 x 8/15

A

75/8 x 8/15

5/1 x 1/1 =

5

37
Q

1 1/4 divided by 2

A

5/4 x 1/2 =

5/8

38
Q

25% of 600

A

.25 x 600

150

39
Q

4 is what % of 80?

A

4/80 =

.05

5%

40
Q

75 is 30% of what number?

A

change 30% to a decimal .3

divided the percentage (75) by the decimal

75/.3 =

250

41
Q

12 hr. 30 min.

-7 hr. 45 min.

_____________

A

11 hr. 90 min.

-7 hr. 45 min.

___________

4 hr. 45 min.

42
Q

5 lb. 6 oz.

x 7

_________

A

35 lb. 42 oz.

but you want the ounces to be less than 16, so see how many times 16 goes into 42. 2 times with 10 left over, so add those 2 to the pounds.

37 lb. 10 oz.

43
Q

27.612 divided by 7.8

A

3.54

44
Q

5 divided by 9 (nearest hundredth)

A

.56

45
Q

6 + 7 x 32 - 8 =

A

6 + 7 x 9 - 8 =

6 + 63 - 8 =

69 - 8 =

61

46
Q

Find the area of a square - s = 9 cm

A

A = s2

A = 81 cm2

47
Q

Find the area of a triangle - b = 9ft.; h = 6 ft.

A

A = 1/2bh

A = 1/2 x 54

A = 27 sq. ft.

48
Q

Find the area of a trapezoid - b1 = 15 m; b2 = 12 m; h = 10 m

A

A = h(b1 + b2)/2

A = 10(15 + 12)/2

A = (10 x 27)/2

A = 270/2

A = 135 m2

49
Q

Find the volume of a cube - e = 4in.

A

V = e3

V = 4 x 4 x 4

V = 64 cu. in.

50
Q

Find the volume of a rectangular solid -

l = 10 ft.; w = 6 ft.; h = 3 ft.

A

V = lwh

V = 10 x 6 x 3

V = 60 x 3

V = 180 cu. ft.

51
Q

Find the volume of a cylinder -

r = 2 cm; h = 3 cm

A

V = pir2h

V = 3.14 x 4 x 3

V = 37.68 cm3

52
Q

3x - 3 = 12

A

3x - 3 + 3 = 12 + 3

3x = 15

3x/3 = 15/3

x = 5

53
Q

2/3x = 10

A

3/2 x 2/3x = 10 x 3/2

x = 30/2

x = 15

54
Q

5x - 2x = 15

A

3x = 15

x = 5

55
Q

6x + 3 = 4x + 11

A

6x + 3 - 3 = 4x + 11 - 3

6x = 4x + 8

6x - 4x = 4x - 4x + 8

2x = 8

x = 4

56
Q

8 - (-5) =

A

7th math (43 decks)

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