Question

1. Find the L.C.M. of the following numbers by listing their multiples
(a) 4,5​

Answer 1

Answer:

20

Step-by-step explanation:

4= 4, 8, 12, 16, 20 24, 28 32...

5=5, 10, 15, 20 ,25 ,30...

Answer 2

The LCM of 4 and 5 is 20

GIVEN

Numbers: 4 and 5

TO FIND

The LCM of the given numbers

SOLUTION

We can simply solve the above problem as follows;

We know that LCM of numbers is the smallest number which is the multiple of given numbers.

Here,

We are given 2 numbers viz, 4 and 5

We will list down their multiples and and then the smallest multiple common to both of them will be the LCM

Now,

Multiples of 4 = 4, 8 , 12, 16, 20, 24, 28, 32, 36, 40

Multiples of 5 = 5, 10, 15, 20, 25, 30, 35, 40, 45, 50

Common multiples of 4 and 5 = 20 and 40

Since,

20< 40

The LCM of 4 and 5 is 20

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