Test 12, Units 1 - 15 Flashcards Preview

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

Flashcards in Test 12, Units 1 - 15 Deck (56):
1


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


true

2


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


true

3


An isosceles triangle has ____ congruent sides.


isosceles has 2 congruent sides

4


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

adjacent

5


The boiling point of water is _____ degrees C.


100

6


The expression 28xyz has how many terms?


one, it is monomial

7


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


False

8


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


true

9


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


true

10


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


False.  Obtuse.

11


Write the formula for finding the area of a triangle


A = 1/2bh

12


Write the simple interest formula


i = prt

13


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


C = pid

14


Write the formula for finding the volume of a cylinder.


V = pir2h

15


Write the formula for finding the perimeter of a square


P = 4s

16


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


120 x 1.61 =

193 km

17


Convert 45 degrees C to the Fahrenheit scale.

9/5C + 32 = F

9/5 x 45 + 32 = F

81 + 32 = F

113 = F

113 degrees F.

18


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.


23 x 69 =

1587 mi.

19


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


Difference is +2 hours, so:

1:35 A.M.

20


Write the number of centimeters in 3.5 meters.


100 centimeters in a meter so:

3.5 x 100 =

350 cm

21


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


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

1/4 in.

 

 

22


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


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

56 oz.

23


Round off 0.579 to the nearest hundredth.


0.58

24


Write the number of degrees in a right angle.


90

25


Write the value of x in

5/8 = x/16


x = 10

26


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


3 cm

27


Write the sum of -6 and -8.


-14

28


change 34/5 to a mixed number


6 4/5

29


Express 1/4% as a decimal.


.0025

30


4732

-1586

_______

 


3146

31


486

x509

______


247,374

32


  1.43

    8.097

+6.54

_________


16.067

33


  .504

x .007

_______


.003528

34


16 2/3

- 7 4/5

_________


8 13/15

35


15 7/8

9 1/2

+ 6 1/3

_________


31 17/24

36


9 3/8 x 8/15


75/8 x 8/15

5/1 x 1/1 =

5

37


1 1/4 divided by 2


5/4 x 1/2 =

5/8

38


25% of 600


.25 x 600

150

39


4 is what % of 80?


4/80 =

.05

5%

40


75 is 30% of what number?


change 30% to a decimal .3

divided the percentage (75) by the decimal

75/.3 =

250

41


12 hr. 30 min.

-7 hr. 45 min.

_____________


11 hr. 90 min.

-7 hr. 45 min.

___________

4 hr. 45 min.

42


5 lb. 6 oz.

x 7

_________


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


27.612 divided by 7.8


3.54

44


5 divided by 9 (nearest hundredth)


.56

45


6 + 7 x 32 - 8 =


6 + 7 x 9 - 8 =

6 + 63 - 8 =

69 - 8 =

61

46


Find the area of a square - s = 9 cm


A = s2

A = 81 cm2

47


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


A = 1/2bh

A = 1/2 x 54

A = 27 sq. ft.

48


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


A = h(b1 + b2)/2

A = 10(15 + 12)/2

A = (10 x 27)/2

A = 270/2

A = 135 m2

49


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


V = e3

V = 4 x 4 x 4

V = 64 cu. in.

50


Find the volume of a rectangular solid -

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


V = lwh

V = 10 x 6 x 3

V = 60 x 3

V = 180 cu. ft.

51


Find the volume of a cylinder -

r = 2 cm; h = 3 cm


V = pir2h

V = 3.14 x 4 x 3

V = 37.68 cm3

52


3x - 3 = 12


3x - 3 + 3 = 12 + 3

3x = 15

3x/3 = 15/3

x = 5

53


2/3x = 10


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

x = 30/2

x = 15

54


5x - 2x = 15


3x = 15

x = 5

55


6x + 3 = 4x + 11


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

6x = 4x + 8

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

2x = 8

x = 4

56


8 - (-5) =