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ARITHMETIC SERIES
There was once a schoolboy who was asked by his
teacher to give the sum of the first 100 counting
numbers.
1 + 2 + 3 + … + 98 + 99 + 100
1 + 2 + 3 +…+ 50 + 51 +… + 98 + 99 + 100
101
101
101
101
101
_x 50 pairings_
5,050
JOHANN CARL FRIEDRICH GAUSS
ARITHMETIC SERIES
It is the sum of an
arithmetic sequence
ARITHMETIC SERIES
• A series such as (3 + 7 + 11 + 15 + ··· + 99 or
10 + 20 + 30 + ··· + 1000) which has a
constant difference between terms.
first term is a1
common difference is d
number of terms is n
last term is an
sum of an arithmetic series is Sn
ARITHMETIC SERIES
The sum of an arithmetic series
is found by multiplying the
number of terms times
the average of the first and last
terms.
ARITHMETIC SERIES
Sn =
𝒏
𝟐
(a1 + an)
Formula ( FINITE SEQUENCE)
~ when an is given
ARITHMETIC SERIES
Formula (INFINITE SEQUENCE)
Sn =
𝐧
𝟐
[2a1 + (n - 1) d]
ARITHMETIC SERIES
3 + 8 + 13 + … + 73
• a1 = 3
• an = 73
• d = 5
• n = ?
• Sn = ?
Example 1
ARITHMETIC SERIES
Sn =
𝒏
𝟐
(a1 + an)
S15 =
𝟏𝟓
𝟐
(3 + 73)
S15 =
𝟏𝟓
𝟐
(76)
S15 = 𝟏𝟓 (38)
S15 = 57𝟎
Example 1
ARITHMETIC SERIES
3 + 7 + 11 + 15 + ··· + 99
ARITHMETIC SERIES
𝟏
𝟑
+
𝟐
𝟑
+ 1 +··· +
𝟏𝟔
𝟑
ARITHMETIC SERIES
Find the sum of the
sequence
-8, -5, -2, ..., 7
•1. integers from 1 to 50
•2. odd integers from 1 to 100
•3. even integers between 1 and 101
•9. 1 + 5 + 9 + … + 49 + 53
•10.
𝟏
𝟐
+
𝟑
𝟐
+
𝟓
𝟐
+… 𝟏𝟕
𝟐
+
𝟏𝟗
𝟐
1. INTEGERS FROM 1 TO 50
Given:
a1=1
an=50
d=1
n= 50
Sn =1275
n=?
Sn=?
2. ODD INTEGERS FROM 1 TO 100
Given:
a1=1
an=99
d=2
n= 50
Sn =2500
n=?
Sn=?
3. EVEN INTEGERS BETWEEN 1 AND 101
Given:
a1=2
an=100
d=2
n= 50
Sn =2550
n=?
Sn=?
9.) 1 + 5 + 9 + … + 49 + 53
Given:
a1=1
an=53
d=4
n= 14
Sn =378
n=?
Sn=?
10.
𝟏
𝟐
+
𝟑
𝟐
+
𝟓
𝟐
+… 𝟏𝟕
𝟐
+
𝟏𝟗
𝟐
Given:
a1=
𝟏
𝟐
an=
𝟏𝟗
𝟐
d=1
n= 10
Sn =50
n=?
Sn=?
ARITHMETIC SERIES
Formula (INFINITE SEQUENCE)
Sn =
𝐧
𝟐
[2a1 + (n - 1) d]
ARITHMETIC SERIES
What is the sum of the first 10 terms in the
series:
3, 7, 11, …
•a1 = 3
•d = 4
• n = 10
•Sn = ?
Example
ARITHMETIC SERIES
Sn =
𝐧
𝟐
[2a1 + (n - 1) d]
S10 =
𝟏𝟎
𝟐
[2(3) + (10 - 1) 4]
S10 =
𝟏𝟎
𝟐
[6 + (9) 4]
S10 =
𝟏𝟎
𝟐
[6 + 36]
S10 =
𝟏𝟎
𝟐
[42]
Solution 1
S10 =
𝟒𝟐𝟎
𝟐
S10 = 𝟐𝟏𝟎
ARITHMETIC SERIES
What is the sum of the first 10 terms in the
series:
3, 7, 11, …
•a1 = 3
•d = 4
• n = 10
• an = ?
• Sn = ?
Solution 2
ARITHMETIC SERIES
an = a1 + (n – 1) d
a10 = 3 + (10 – 1) 4
a10 = 3 + (9) 4
a10 = 3 + 36
a10 = 39
Solution 2
ARITHMETIC SERIES
Sn =
𝒏
𝟐
(a1 + an)
S10 =
𝟏𝟎
𝟐
(3 + 39)
S10 = 5 (42)
S10 = 𝟐𝟏𝟎
Solution 2
ARITHMETIC SERIES
Find the sum of the
first 12 positive
even integers.
ARITHMETIC SERIES
Find the sum of the
first 10 negative
integers
ARITHMETIC SERIES
Find the sum of the
first 20 terms of the
sequence 4, 6, 8,
10, ...
ARITHMETIC SERIES
Find the sum of the first
nine terms of the
arithmetic sequence with
𝒂𝟏 = −𝟐 and 𝒅 = 𝟓.
ARITHMETIC SERIES
Find the sum of the first
five terms of the
arithmetic sequence with
𝒂𝟏 =
𝟏
𝟒
and 𝒅 = −𝟏.
ARITHMETIC SERIES

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Grade 10 Mathematics Arithmetic Series Lesson