Transcript My math study guide

OMG! Algebra is easy. First, an “expression” is just a number
sentence. For example, if you wanted to buy the Wii games and you
didn’t know how much these games cost you could show this “number
expression” by writing
3 x _________ . The blank is there because it’s what you don’t know,
the cost of each game. With algebra, instead of a blank you put a
letter. It could be any letter. X, Z, G… Usually the letter is the first
letter of the thing you talking about. So to write an algebraic
expression you would write:
3 x C.
3 because you want 3 games and C because you don’t know the Cost of
each game.
Mrs. Sweetland gives 3 bonus points for each extra-credit
problem correctly completed. If b stands for the number of
extra-credit problems correctly completed, which
expression is equal to the total number of bonus points?
• a. b x 3
A++
• b. b + 3
• c.
b÷3
• d. b - 3
• e. 3 > b
guessed
a, you
are correct.
It is notIf
e you
because
it just
doesn’t
go
for you!!
using the
process
with theGood
problem
and itBydoesn't
make
of elimination, a is the only answer
any sense.
left. But it is also correct because
it makes sense and if you use it in
It is not d the
because
b-3 would
be taking
away
problem,
you should
get the
points, not right
adding
them.
answer.
It is not c because it doesn’t make sense in
the problem and you would not be getting the
full score if you divided it.
And it is not b because once again, you would not
be getting the full score if you added 3.
Find the value of y.
x-y=y
x = 10
D is the correct
Since
we know
that
We
already
know
that
• A. 32 answer!
y= the
samecan’t
thingbe
as
10-32= -22
the
number
•
•
•
•
B.
C.
D.
E.
16
4
5
2
10-16= -6
10-4=6
10-5=5
10-2=8
y, e and cThat
are not
the
negative.
takes
answer.
these
two out.
You know how to find the sum of the angles of a polygon. The
sum of the angles for a triangle (3 sides) is 180. The sum of the
angles of a quadrilateral (4 sides) is 360. The sum of the angles
of a pentagon (5 sides) is 540. If “S” is the amount of sides,
which expression can be used to illustrate this way of finding the
sum of the angles of any polygon.
•
•
•
•
A. (S – 2) * 180
B. S + (2 + 180)
C. 180 * S
D. (360 x 2)
This is correct because there
45 3 sides on a triangle. And
are
we want
getthe
180, and
We ifneed
onetoof
subtract 2 from 3 sides, we
number
sentences
over
endNot
up
with
3-2=1
1x180=180!
Correct
there to equal what we
Notthe
Correct
got for
angles on
90
the triangle.
Not Correct
You add up the angles and the sum for
any triangle is 180
90
45
45
180
45
120
90
90
100
90
You add up the angles and
the sum for any square or
rectangle or 4 sided figure
and the sum is 360
90
90 from the
Use what you learned
90 we take
last slide to know that
90 2x180 to
4-2 to get 2. Then take
90
get 360!!
360
100
110
110
Now all you have
110 to do is
take the number
110 of sides (5)
and subtract100
2. Now take 3
(the number 100
you got) times
120
180 to get 540!!
540
180
360
720
Since the sum of a triangle is
180, all you have to do is find
the triangles in the shape.
540
100
125
How much fencing is
needed to go around
the perimeter of this
yard?
+ 75
50
125
65
+35
100
100
125
+ 35
75
65
50
450
Thelast
answer
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is:
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ison
450
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correctly,
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add the
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doto
that,
add
50ft
and and
Do you get why? Discuss it with
perimeter.
35ft.
75ft.
your teacher.
100
50 ft
75 ft
How much sod is
needed to cover this
yard?
65
+ 35
100
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the
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take the
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missing
numbers
are.the
50
and slide
it blue
over.line is
bottom
of the
75.
A buzz number… What could it be?
A buzz number is a number that has less than 2 factors. Sounds confusing,
huh? Well, It is not.
If you were counting with buzz numbers included, you
would start off like this.
*
*
*
4
*
8
9
10 *
•14
15
•20 21
•26 *
*
6
12
16 *
18
22
24 25
*
28 *
*
30 *
•32 33
34
35 36 *
•38 *
40
*
42 *
•44 45
46
*
48 49
Remember,
a buzz
number has
LESS than
2 factors.
On this ppt.,
they look
like this- *.
One angle of a RIGHT triangle is 30
degrees. Which expression shows how to
find the measure of the third angle?
???
30
90
A. 3* 180=A
B. 3 * 90 + 60=A
C. (360 / 3) - 90
D. 180 – 90 – 30=A
Calvin’s little brother jumped up and down. “Here they come!”
shouted Calvin. Around the corner came the Thanksgiving
Day Parade. Half of the people were on floats; 25% were in
marching bands; clowns made up 1/8; tv stars made up 1/16;
and there were 10 city officials, or 1/16. How many people
were in the parade, and how many were in each group?
Thanksgiving
Parade
Fraction
Floats
Marching
Bands
Clowns
TV Stars
City
official
s
Total
people
Decimal
Percent
Whole
Number/to
tal number
of people
About how much of each hour does a radio program
schedule for weather?
A. 1/10
B. B. 2/10
C. C. 3/10
D. D. 5/10
E. E. 10/10
How many minutes of each hour does a radio program schedule for weather?