Transcript 1/16 - TeacherTube

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?
It can’t be b because b+3
would not be the right
score.
It can’t be c because b/3
would still not be the right
score.
It can’t be d because b-3
would still not be the right
score.
a. b x 3
b. b + 3
c. b ÷ 3
d. b - 3
e. 3 > b
It can be a because
bx3 would be the right
score.
It can’t be e because 3>b
would still not be the right
score.
Find the value of y.
x-y=y
x = 10
•
•
•
•
•
A.
B.
C.
D.
E.
32
16
4
5
2
10-32= -22
10-16= -6
10-4=6
10-5=5
10-2=8
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.
45
•
•
•
•
A. (S – 2) * 180
B. S + (2 + 180)
C. 180 * S
D. (360 x 2)
90
You add up the angles and the sum for
any triangle is 180
45
90
45
+ 45
180
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
90
90
360
100
90
110
110
You add up the angles and
the sum for any 5 sided figure
and the sum is 540
110
110
100
100
120
540
180
360
6-2=4x180=720
540
First I took 6-2 to get 4. Then I took
4x180 to get 720.
50+75=125
How much fencing is needed to
go around the perimeter of this
yard?
65+35=100
50+75=125
125+100=225
How much sod is needed to
cover this yard?
35+65=100
One angle of a RIGHT triangle is 30
degrees. Which expression shows how to
find the measure of the third angle?
60
???
30
90
A. 3* 180=A
540
B. 3 * 90 + 60=A
330
C. (360 / 3) - 90
30
D. 180 – 90 – 30=A
60
Thanksgiving Calvin’s little brother jumped up and down. “Here they come!”
Parade
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?
Fraction
Floats
Marching
Bands
Clowns
TV Stars
City
official
s
Total
people
½
¼
1/8
1/16
1/16
1
Decimal
Percent
Whole
Number/to
tal number
of people
.5
50%
80
.25
25%
40
.125
12.5%
20
.0625
.0625%
.0625
.0625%
1
100%
10
10
160
½ floats
¼
bands
1/8
clowns
1/16
TV
stars
1/16
city
officia
ls 10
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?
Question 14 Which table of values satisfies the
equation shown below?
y=x+4
0+4=4 =y
A.
1+4=5
C.
1+4=5
2+4=6
3+4=7
B.
0+4=4
D.
2+4=6
• What should be the value for x in the triangle
shown?
• A. 70° 70+50+60=180
• B. 10°
• C. 90°
• D. 40°
10+50+60=120
90+60+50=200
40+60+50=150
4 * 30 = 120
4
Four friends are planning to buy
an XBOX for another friend. The
XBOX costs $126.00. How
much will each friend have to
contribute?
Number sentence-126.00/4
solution-$ 31.50 Remainder?: a.
Report as decimal b. Ignore
c. Round
I chose 30
because 120 /
4 = 30
126.00
- 120.00
30
1
6.00
- 4.00
+.50
2.00
-2.00
0.00
31.50
I chose 1 because 4
*1=4
I chose .50
because 4*.50=2.
Greatest Common Factors
6/30
I took 6 from 6/30. These are
the factors for 6.
2*3=6
1 2
3 6
6 is the common factor for
1*6=6 6.
1 2 3 5 6 10 15 30
I took 30 from 6/30. These are the
factors of thirty.
1*30=30