OBJECTIVES
Hello number 2
Hello number 5
LET US FIND OUR MULTIPLES
My multiples are
4
14
2
6
8
10
12
35
25
30
15
10
40
20
18
20
16
MY MULTIPLES ARE
5
Let us find our common multiples
I have 10 , 20
I also have 10 & 20
He ! 10 & 20 are our common multiples.
10 is our lowest common multiple called LCM.
Lets do the same in another way.
2,4,6,8,10,12,14,16,18,20
5,10,15,20,25,30,
10 ,20
10 & 20 are common multiples.10 is the lowest common multiple.
Class :- V
Subject :- Maths
Topic :- Be My Multiple, I’ll be Your Factor.
OBJECTIVE :-
(i) Understands the concept of multiples and factors.
(ii) Identifies the multiples and factors.
TEACHING AIDS :-
Multiplication Table, Geometry box, some objects like bangle, seeds, pebbles.
FACTORS :-
Numbers which are multiplied together to give a new number are called the factors of the new number so obtained.
MULTIPLE :-
The result of multiplication is called multiple of each factor.
Example :- 2 x 3 = 6
Here 2 and 3 are factors of 6
But 6 is the multiple of both 2 and 3.
PROPERTIES OF FACTORS :-
(1) Every number has at least two factors.
4 x 7 = 28
(2) 1 is a factor of every number.
5 x 1 = 5
(3) 1 is the smallest factor of every number.
12 = 12 x 1
& 12 = 3 x 4
(4) Every number is a factor of itself.
15 x 1 = 15
(5) A factor of a number is either less than or equal to the number itself.
72 = 8 x 9
= 72 x 1
= 18 x 4 etc.
PROPERTIES OF MULTIPLES :-
(1) Every number is a multiple of 1.
1 x 7 = 7.
(2) Every number is a multiple of itself.
8 x 1 = 8.
(3) Zero is a multiple of every number.
6 x 0 = 0.
(4) Every non-zero multiple of a whole number is � either greater than or equal to the number.
Ist multiple of 9 = 1 x 9 = 9
2nd multiple of 9 = 2 x 9 = 18
MULTIPLES AND COMMON MULTIPLES :-
Find multiples of 3 and 5.
Ist multiple of 3 = 1 x 3 = 3
2nd multiple of 3 = 2 x 3 = 6
3rd multiple of 3 = 3 x 3 = 9
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Ist multiple of 5 = 1 x 5 = 5
2nd multiple of 5 = 2 x 5 = 10
3rd multiple of 5 = 3 x 5 = 15
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COMMON MULTIPLES :-
Find Common multiples of 3 and 5.
Multiples of 3 = 3, 6, 9, 12, 15, 18, 21, 24, 27, 30 ..........
Multiples of 5 = 5, 10, 15, 20, 25, 30, 35, 40, 45, 50.......
Common multiples of 3 and 5 = 15, 30, 45 ....................
3 6 5 10
(3) 9 12 15 20 25 (5)
18 21 30 35 40
24 27 45 50 55
FACTORS AND COMMON FACTORS :-
Find factors of 10 and 18.
10 = 1 x 10 18 = 1 x18
= 2 x 5 = 2 x 9
= 5 x 2 = 3 x 6
= 10 x 1 = 6 x 3
Thus factors of = 9 x 2
10 = 1, 2, 5, 10 = 18 x 1
Thus factors of
18 = 1, 2, 3, 6, 9, 18
COMMON FACTORS :-
Find common factors of 10 and 18.
Factors of 10 = 1 , 2 , 5, 10
Factors of 18 = 1 , 2 , 3, 6, 9, 18
Common factors of 10 and 18 = 1, 2
(10) (18)
3
8
5 1 6
10 2 9
18
FACTOR TREE :-
Factor Tree of 24 in three different ways.
CORRELATION WITH OTHER SUBJECTS :-
It is related to G. Sc.
Assessment :-
(i) Find ten multiples of 7.
(ii) Find three common multiples of 5 and 7.
(iii) Find factors of 15.
(iv) Find common factors of 25 and 35.
(v) Draw factor tree of 32.
Value :-
(i) Develops sequential thinking and accuracy.
(ii) Habit of Co-operation.