Transcript 90 - 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. Sweet land 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
• c.
b. b + 3
b ÷ 3 d. b - 3
• e. 3 > b
The answer is B*3 MRS.
SWEETLAND SAID 3
BONUS POINTS FOR EXTRA CRTE
Find the value of y.
x-y=y
x = 10
•
•
•
•
•
A.
B.
C.
D.
E.
32
16
4
5
2
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 380
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
180
1
180
8
180+180=
0
360
180
I GOTEXPLANTION
MY ANSWER WHEN I
NOTICE THAT
YOU ADD 180 TO EVERY ONE
180
360+180=
540
SO 180+180=360THEN
360+180=540.
Question 6
• What is the value of
the expression
shown?
• 16+10/2*4=BLAN
•
•
•
•
K
A. 42
B. 52
C. 72
D. 12
EXPLANTION
FIRST YOU DO 10/2=5.
THEN YOU DO5*4 WHICH
EQUALS 20. LAST YOU DO
20+16=42,AND THAT IS
YOUR ANSWER
QUESTION 9
• Which correctly describes the rule
between x and y as shown in the table?
Question 17
How much fencing is needed to
go around the perimeter of this
yard?
How much sod is needed to
cover this yard?
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
Fraction
Decimal
Percent
Whole
Number/t
otal
number
of people
Floats
1/2
0.50
50% 80
Marching
Bands
1/4
0.25
25% 40
Clowns
1/8
.125
12.5 20
5
TV Stars
City
offici
als
1/16
1/16
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?
.06 10% 10
25
.06 10% 10
25
Total
peopl
e
This ½
and this
is twice
as big
as 1/4
80
40
20 2
0
10
This 1/4 is twice as
big as 1/8
This is 1/8
and this is
twice as big
as /16
10
Since these are the same
fraction they both have to be 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?