region iv a module 1 sequences revised 2
TRANSCRIPT
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Regional Mass Training of Grade 10 Regional Mass Training of Grade 10
Teachers of The K To 12 Teachers of The K To 12
Enhanced Basic Education ProgramEnhanced Basic Education Program
Venue: De La Salle University-Dasmariñas City of DasmariñasDate: May 3-8, 2015 (First Batch) May 10-15, 2015 (Second Batch)
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Module 1Sequences
May 12, 2015
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Objectives of the Session
DepED – Region IVA CALABARZON
At the end of the session, the teacher-participants are expected to:
1. demonstrate knowledge of key concepts on sequences;
2. appreciate sequences as functions; and3. apply sequences in solving problems.
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Priming
DepED – Region IVA CALABARZON
Guess the next term based on the patterns!!!
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What comes next?
O T T F F S S E N _?
T for tenT for ten
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A E I M Q _?
DEPARTMENT OF EDUCATION
U
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J M M J A O _?
DEPARTMENT OF EDUCATION
D - DECEMBER
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T Q P H H O N _?
DEPARTMENT OF EDUCATION
D - DECAGON
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1, 4, 9, 25, - - -
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36
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2 4 5 7 9 11 _?
DEPARTMENT OF EDUCATION
13 – LOCAL TV CHANNELS
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R O Y G B I _?
DEPARTMENT OF EDUCATION
V – VIOLET
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2 3 5 7 9 11 13 17 _?
DEPARTMENT OF EDUCATION
19
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1 9 25 49 81 _?
DEPARTMENT OF EDUCATION
121
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A B C E F G _?
DEPARTMENT OF EDUCATION
I
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P E M D A _?
DEPARTMENT OF EDUCATION
S
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2 7 12 17 22 _?
DEPARTMENT OF EDUCATION
27
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2 3 5 6 8 9 _?
DEPARTMENT OF EDUCATION
11
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A J S _ ?
DEPARTMENT OF EDUCATION
N – NOVEMBER, MONTHS WITH EXACTLY 30 DAYS
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A, 1, B, 2, C, 3, - - - -
D
DEPARTMENT OF EDUCATION
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0, 1, 16, 81, - - - -
625
DEPARTMENT OF EDUCATION
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Congratulations!
DEPARTMENT OF EDUCATION
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Group Activity
DepED – Region IVA CALABARZON
On a manila paper, give relevant information on sequences presented based on the slides. Give some properties related to the sequences. After 5 minutes, the group output will be presented to the class by the assigned presentor.
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Analysis
DepED – Region IVA CALABARZON
•1. What have you been thinking/feeling after you finished the activities?
•2. If you will place yourself in one of your students’ shoes, what will they feel after doing the activities?
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Lesson 1: Arithmetic Sequence
DepED – Region IVA CALABARZON
In this lessons, the learner will learn to:-generate and describe patterns-find the next few terms of a sequence-find the general or nth term of a sequence-find the arithmetic means between terms of an arithmetic sequence-determine the sum of the first n terms of a given arithmetic sequence-solve problems involving arithmetic sequence
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Lesson 2: Geometric and othe Sequences
DepED – Region IVA CALABARZON
In this lessons, the learner will learn to:
- illustrate a geometric sequence-differentiate a geometric sequence from an arithmetic sequence-determine the nth term of a given geomtric sequence-find the geometric means between terms of a geometric sequence-illustrate other types of sequences like harmonic sequence and Fibonacci sequence-solve problems involving geometric sequence
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Sequences
DepED – Region IV-A CALABARZON
SEQUENCES
NUMBER SEQUENCES
NON-NUMBER SEQUENCES
(OTHER TYPES)
ARITHMETIC SEQUENCES
GEOMETRIC SEQUENCES
REAL-LIFE PROBLEMS ON SEQUENCES
NTH TERM OF A SEQUENCE
SUM OF THE N TERMS OF SEQUENCES/
INFINITE GEOMETRIC SEQUENCE
ARITHMETIC/ GEOMETRIC MEANS
NEXT TERMS OF A SEQUENCE
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What is a sequence?
DepED – Region IVA CALABARZON
Definition: A sequence is a function whose domain is the finite set {1, 2, 3, …, n} or the infinite set {1, 2, 3, …}
Recall: A function is a correspondence from a set A to a set B which matches a unique member of set A to a member of set B.
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It can be a pattern of :
• objects• music• letters• or numbers
A sequence is a pattern.
What is a sequence?
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Terms of Sequences
DepED – Region IVA CALABARZON
A sequence is the “correspondence” or “rule” itself. For number sequences, the formula may be given as an equation.
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Terms of Sequences
DepED – Region IVA CALABARZON
CONVENTION: The terms of the sequence is loosely referred to as the sequence itself.
( ) nnf 3=
Ex: From the set of natural numbers n match 3n
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Terms of Sequences
DepED – Region IVA CALABARZON
( ) nnf 3=
},,{: 321fofDomain
},,{: 963fofRange
We refer to {3, 6, 9} as the sequence for convenience onlyconvenience only although 3, 6, and 9 are the terms in the range of the sequence. The sequence is the correspondence itself.
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SPECIAL TYPES OF NUMBER SEQUENCES
DepED – Region IVA CALABARZON
1. Arithmetic Sequence
2. Harmonic Sequence3. Geometric Sequence4. Fibonacci Sequence
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ARITHMETIC SEQUENCE...
DepED – Region IVA CALABARZON
An arithmetic sequence is a sequence whose every term, except the first, is obtained by adding to the previous term a constant called the common difference.
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Arithmetic Sequence
DepED – Region IVA CALABARZON
Notations:
a1= first term of the sequencean = nth term of the sequenced = common differenceAn = sum of the first n terms of the arithmetic sequence
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Arithmetic Sequence
DepED – Region IVA CALABARZON
a2 = a1 + da3 = a2 + d = a1 + 2d
an = a1 + (n-1)d
.
.
.
sequencetheoftermsta 1=1
sequencetheoftermnthan =
d = common difference
An = sum of the first n terms of the sequence
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Arithmetic Sequence
DepED – Region IVA CALABARZON
Let An = a1 + a2 + · · · + an
An = an + an-1 + · · · + a1
Adding the two equations, 2An = a1 + an + a2 + an-1 · · · + an+ a1
2An = (a1 + an)+ (a2 + an-1)· · · + (an+ a1)2An= n(a1+an) (why?)
)( naan
nA +12=
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ARITHMETIC SEQ.
DepED – Region IVA CALABARZON
Now take note that an = a1 + (n-1)dHence
An = (n/2)[2a1+ (n-1)d]
This is another formula for the sum of the terms in the arithmetic sequence
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ARITHMETIC SEQ.
DepED – Region IVA CALABARZON
Example:1.What is the nth term of the arithmetic sequence 7,9, 11, 13, 15, 17, . . . ?
Answer : 2n+5
2. If three arithmetic means are inserted between 11 and 39, find the second arithmetic mean.
Answer : a2 = 25.
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GEOMETRIC SEQUENCE...
DepED – Region IVA CALABARZON
A geometric sequence is a sequence whose every term, except the first, is obtained by multiplying a constant called the common ratio.
Example : 32, 16, 8, 4, 2, 1
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Geometric Sequence
DepED – Region IVA CALABARZON
Notations:a1= first term of the sequencean = nth term of the sequence = a1rn-1
r = common ratioGn = sum of the first n terms of the geometric sequence
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Geometric Sequence
DepED – Region IVA CALABARZON
Multiplying both sides by r,
Subtracting this from the previous equation,
where r≠1
Gn= a1 + a1r + a1r2 + • • • + a1rn-1
rGn= a1r + a1r2 + a1r3 + • • • + a1rn-1 + a1rn
(1-r)Gn= a1 - a1rn
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Geometric Sequence
DepED – Region IVA CALABARZON
where r≠1
The sum of a geometric sequence is
What if r =1 ?If r =1 , Gn = a1 + a1 + a1 + · · · + a1
Gn = na1
What if r =-1 ? (Hint: Consider the case when n is even and when n is odd.)
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Geometric Sequence
DepED – Region IVA CALABARZON
Examples:
1. What is the 6th term of the geometric sequence ?
Note that r = 5, n = 6 , an = a1rn-1
( )250
5252
6
56
516
=
=
=
a
a
raa The 6th term of the geometric sequence is 250.
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Geometric Sequence
DepED – Region IVA CALABARZON
2. Find the sum of the geometric sequence where the first term is 3, the last term is 46875 and the common ratio is 5.
Answer : 58,593 (Why?!)
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Infinite Geometric Sequence
DepED – Region IVA CALABARZON
Now, what is the sum of an infinite geometric sequence ? a1 , a2 , a3 , . . . a1 , a1r , a1r2 , . . .Originally we have
ra
G
,rif
n −=
<<−
1
11
1
r ≠ 1
But as n approaches infinity,
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Geometric Sequence
DepED – Region IVA CALABARZON
Example : What is the sum of the geometric sequence
+−+−91
31
13
Solution :
31
31−== r,a
49
31
1
3 =
−−
=nG
?
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HARMONIC SEQUENCE...
DepED – Region IVA CALABARZON
A harmonic sequence is a sequence whose reciprocal of every term forms an arithmetic sequence
Example : ,...81
,61
,41
,21
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FIBONACCI SEQUENCE...
DepED – Region IVA CALABARZON
A Fibonacci sequence is a sequence whose every term, except the first two terms, is obtained by adding the two previous terms. The first two terms may be 1, 1 or 0, 1.
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ACTIVITY
DepED – Region IVA CALABARZON
What to look forwhen looking for the rule
defining a sequence?
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Here is a sequence of objects
Correct! It would be a mouse.
What animal would come next in this sequence?
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Here is a sequence of sounds
What sound will come next in the sequence?
Correct! It will be the cow mooing.
Hear me!! (click each one)
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Here is a sequence of letters.
What letter will come next in the sequence? Look carefully at
the letters.
a a b c a a b c a a b c a
Correct! It‘s the letter a.
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Here is a sequence of numbers.
What number is going to come next in this
sequence?
0 2 4 6 8 10 12 14 16
Correct it is the number
18DEPARTMENT OF EDUCATION
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•Decide what number should come next
Tip! To find the next number in a number sequence:
•Put your number into the sequence and check that it looks correct
•Find the pattern
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Play
and finish these number
sequences.
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Look at the number sequences and see if you can
work out the missing number.
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Find the number!
1 3 5 7 9 13 15 17
It is the number 11.
11
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Find the number!
Correct! It is the number 15.
0 5 10 ____ 20 25 30 35 4015
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Find the number!
Correct! It is the number 11.
17 15 13 ____ 9 7 5 3 11
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Find the number!
Correct! It is the number 55.
25 35 45 ___ 65 75 55
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34 44 54 64 ___ 84 94
Now race on to the last number
sequence.
Find the number!
Correct! The missing number is 74.
74
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42 47 ___ 57 62 ___ 72 ___ 8252 67 77
The answers are: 52 67 and 77
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ACTIVITY!!
DepED – Region IVA CALABARZON
Answer the following : p. 18 Activity 10 Groups 1- 3 : odd numbers Groups 4 & 5 : even numbers
p. 40 Activity 9
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ACTIVITY!! Puzzle Sequences!!
DepED – Region IVA CALABARZON
On a whole sheet of Manila paper, your group is tasked to create a puzzle for the enjoyment of kids and adults alike!!
The puzzle may include terminologies on sequences and may involve solving problems on sequences.
Suggestions:
CROSSWORD PUZZLESNAKES AND LADDERS
NOTE: Please include the mechanics of the puzzle.
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Closure
https://www.youtube.com/watch?v=SjSHVDfXHQ4
DepED – Region IVA CALABARZON
Watch the Tedtalk on youtube and write a brief reflection on the talk. Include how you could relate sequences to your students using localized or contextualized examples!
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Closure
DepED – Region IVA CALABARZON
Instruct a wise man and he will be wiser still; teach a righteous man and he will add to his learning. Proverbs 9:9
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Acknowledgement of Sources:
www.worldofteaching.comwww.youtube.comwww.xpowerpoint.com
DepED – Region IVA CALABARZON
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http://www.myniceprofile.com/thank-you-149669.htmlDepED – Region IVA CALABARZON