Geometry 30%

Strategies

use answers

don't forget the 2nd step

some answers are a set-up

Know measurement

All word problems

A) too large

B) answer

C) 2nd step

D) too small

(Order of operations)

Please Remember My Dear Aunt Sally

MATH TEST p. 404

answers from lecture:

RATIO

28)

10 km = 45km

6.2 miles x

10x = 279

x = 27.9

29) Easy D

30)

P= (18 + 22) x 2 = 80

80 = 20 For each side of square

4

Area = s squared

20 x 20 = 400 sq. units

31)

x = tie

3x = shirt

3x = slacks

2(3x) = sports coat

x + 3x + 3x + 6x = 156

13x = 156

x = 12

don't forget 2nd step

3x

3(12) = 36

32)

draw (x,y) axis

II I

III IV

33)

x = Fran

x + 4 = Tom

x + (x + 4) = 24

Fran Tom Total

34)

Don't worry about it.

35)

Algebra - I know this stuff

36)

Know fractions

3/5 > 1/2

7/13 > 1/2

23/44 > 1/2

37)

Range Idea between 1 - 100

Range = High - Low

100 - 1 = 99

Divide by LCM of 5 and 3

(divide by hand)

6 integers between 1 and 100.

38)

Asks about 5-10 and 4-8

no.

They have the same numbers contained in them.

Can't be determined

39)

xy > 0

x(1) = x

xy = x

40)

4.75

- 2.00

2.75

82.50 - 2.75

41) Easy

42) not easy

Area = 4 x 4 = 16cm sq.

1/2 shaded

1/2 unshaded

1/2 (16) = 8cm sq.

43)

give away

I missed an easy one. Use a calculator

44)

Know probability

5 weekdays out of 7 total days

5

7

45)

Know the number line, got this one right

46)

AB product

= is

A+ B sum

A + B + 5 5 more than sum

KNOW ORDER OF OPERATIONS

AB = A + B + 5

47) Combination

10 x 10 x 10 = 100

48)

multiplication problem

49)

Use answers

.30 x 80 = 24

or

.30x = 24

x = 80

50) fraction easy

51) use substitution

a < b < c < d < 0

-4 -3 -2 -1

52)

graphing, I get the graphing

53)

Commutative = order

Associative = Grouping (Paranthesis)

Distributive = a(b+c) =

ab + ac

54)

Straight Line = 180 degrees

72 + 25 + m + n = 180 degrees

m + n = 83

180

- 97

83

MOST IMPORTANT PART

Geometry p. 183

Lines

Triangles

Area/Perimeter

Surface Area

Volume

The sum of two sides is greater than the third side.

180 degrees inside a triangle

Exterior angle = sum of opposite interior angles

Pythagorean Triples

( fill in squares)

a + b = c

Know Pythagorean triples

Triangle are = 1 bh = Area

2

1 base x height

(Area is always sq. units)

Square Rectangle

b x h b x h

(make examples)

Parallelogram Trapezoid

A = bh A = b + b (h)

2

Find the average base x height

(write in for pie)

= 3.14

Area = Circumference =

Rectangular Solids

Cube = 6 sides

Square Area = 6 x area of one face

Volume = l x w x h

(Make a sample for Surface Area and Volume)

RATIO'S

(know Ratio's)

tail 1/2

head 1/2

2 times in row

1/2 x 1/2 = 1/4

3 times in a row

1/2 x 1/2 x 1/2 = 1/8

6 face ( cube)

1 = 1/6 4 = 1/6

2 = 1/6 5 = 1/6

3 = 1/6 6 = 1/6

Sum of 2 dice

36 possible combinations on 2 dice

Most often number rolled on two dice

greatest possibility is on a 7

(copy notes on red tab page)

Combinations

5 bread

3 cheese

4 meat

2 toppings

Use 1 of each item to make a sandwich

5 x 3 x 4 x 2 = 120 total combinations

Factorial

(draw lines)

A B C D How many ways can the books be arranged

4! = 4 x 3 x 2 x 1 = 24

A Player on a baseball team

9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1

Coin = 1/2

Dice = 1/6

Sum of 2 dice = 1/36

Sandwich = 1 of each and multiply

Players on a basketball team

9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1

Which is more - Height of can or circumference of balls

Answer:

Height = 3 in.

Circumference = 3.14(1)

Circumference is greater

Data

53, 50, 13, 20, 22, 31, 34, 33, 45.

41, 42

(graph) Stem and Leaf plot

1) Data is in order

2) Other computing are there, like

3) median, range, and mode are easy to find.

mean = add up everything and divide by the number of items

median = number even in the middle

mode = most often

range = difference of extremes

Stem and Leaf leads to box whisker graph.

(draw diagram of steps)

How much cement?

How much carpet?

How much paint?

Find the number 1,000. Row and column

A B C D E F

1 1 2 3 4 5 5

2 7 8 9 10 11 12

3 13 14 15 16 17 18