How do you find the LCM of 4 numbers?

Answer 1

The same as with 2. Example: 30, 42 and 70

Factor them.

2 x 3 x 5 = 30

2 x 3 x 7 = 42

2 x 5 x 7 = 70

Combine the highest amount of each factor.

2 x 3 x 5 x 7 = 210, the LCM

Find the lcm of the first two and then find the lcm of that number and the third.

Example:Find the LCM of 4, 6, and15.

The LCM of 4 and 6 is 12 and the LCM of 12 and 15 is 60, so the answer if 60.

Answer 2

First take HCF (highest common factor) of all numbers and save this in a variable then take another variable and multiply all these numbers and then dived the second and first variable .This will be the LCM of numbers. Hint: For finding HCF use this code for two variable and convert it for four variables int hcf(int first,int second)

{

int rem=0;

int div=first;

int divd=second;

if (first>second)

{

do

{

rem=divd%div;

if (rem==0)

break;

divd=div;

div=rem;

}while (rem!=0);

return div;

}

else

{

div=second;

divd=first;

}

do

{

rem=divd%div;

if(rem==0)

break;

divd=div;

div=rem;

}while (rem!=0);

return div;

}

Factor each number down to its primes, then compare the lists for the smallest number in all four lists

Answer 3

The same as with two.
Example: 30, 42, 54, 60
Factor them.
2 x 3 x 5 = 30
2 x 3 x 7 = 42
2 x 3 x 3 x 3 = 54
2 x 2 x 3 x 5 = 60
Combine the factors, eliminating duplicates.
2 x 2 x 3 x 3 x 3 x 5 x 7 = 3780, the LCM

Answer 4

Example: 30 and 42

Factor them.

2 x 3 x 5 = 30

2 x 3 x 7 = 42

Combine the factors, eliminating duplicates.

2 x 3 x 5 x 7 = 210, the LCM
Find the LCM of the first two and then find the LCM of that number and the third.

Example:Find the LCM of 4, 6, and15.

The LCM of 4 and 6 is 12 and the LCM of 12 and 15 is 60, so the answer if 60.

Answer 5

The same as with two. Example: 30, 42, 54, 60
Factor them.
2 x 3 x 5 = 30
2 x 3 x 7 = 42
2 x 3 x 3 x 3 = 54
2 x 2 x 3 x 5 = 60
Combine the factors, eliminating duplicates.
2 x 2 x 3 x 3 x 3 x 5 x 7 = 3780, the LCM

Answer 6

Example: 30 and 42

Factor them.

2 x 3 x 5 = 30

2 x 3 x 7 = 42

Select the highest amount of each factor.

2 x 3 x 5 x 7 = 210, the LCM

It's the same process no matter how many numbers in the group.

Answer 7

Prime factorization.

Answer 8

Prime factorization.