# Lcm of 20 18 and 27 relationship

### GCD and LCM Calculator with detailed explanation

(ii) To find LCM of 20, 72 and 20 = 22 × 5 72 = 23 ×32 2 20, 72, 2 10, 36, 5 5, 18, 3 9, 18, 3, 27 3 3, 6, 1, 9 Relations between LCM and HCF. Common multiples are multiples that two numbers have in common. News · History · Geography · Structures & Buildings · World Rulers · Disasters · Flags of the World · Statistics · International Relations · Travel · Religion Multiples of 2: 2 , 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 Multiples of 3: 3, 6, 9, 12, 15, 18, 21, 24, Calculator to find Greatest Common Divisor and Least Common Multiple with GCD and LCM calculator The divisiors of 54 are: 1, 2, 3, 6, 9, 18, 27,

Well, this one might pop out at you, because 36 itself is a multiple of And 36 is also a multiple of It's 1 times So the smallest number that is both a multiple of 36 and because 36 is a multiple of is actually Let's do a couple more of these.

### Multiples, Factors and Powers

That one was too easy. What is the least common multiple of 18 and 12? And they just state this with a different notation.

The least common multiple of 18 and 12 is equal to question mark. So let's think about this a little bit. So there's a couple of ways you can think about-- so let's just write down our numbers that we care about. We care about 18, and we care about So there's two ways that we could approach this.

### Least common multiple (video) | Khan Academy

One is the prime factorization approach. We can take the prime factorization of both of these numbers and then construct the smallest number whose prime factorization has all of the ingredients of both of these numbers, and that will be the least common multiple.

So let's do that. So we could write 18 is equal to 2 times 3 times 3.

That's its prime factorization. So 12 is equal to 2 times 2 times 3.

## Least common multiple

Now, the least common multiple of 18 and let me write this down-- so the least common multiple of 18 and 12 is going to have to have enough prime factors to cover both of these numbers and no more, because we want the least common multiple or the smallest common multiple.

Finding the LCM of 3 or more numbers 127-2.22

Well, it needs to have at least 1, 2, a 3 and a 3 in order to be divisible by So let's write that down. So we have to have a 2 times 3 times 3.

## Relationship between H.C.F. and L.C.M.

This makes it divisible by If you multiply this out, you actually get And now let's look at the Common multiples and the LCM An important way to compare two numbers is to compare their lists of multiples.

Let us write out the first few multiples of 4, and the first few multiples of 6, and compare the two lists. The numbers that occur on both lists have been circled, and are called common multiples. The common multiples of 6 and 8 are 0, 12, 24, 36, 48,… Apart from zero, which is a common multiple of any two numbers, the lowest common multiple of 4 and 6 is These same procedures can be done with any set of two or more non-zero whole numbers.

A common multiple of two or more nonzero whole numbers is a whole number that a multiple of all of them. The lowest common multiple or LCM of two or more whole numbers is the smallest of their common multiples, apart from zero. Hence write out the first few common multiples of 12 and 16, and state their lowest common multiple.

Hence write down the LCM of 12, 16 and 24? Solution a The multiples of 12 are 12, 24, 36, 48, 60, 72, 84, 96,,… The multiples of 16 are 16, 32, 48, 64, 80, 96,,… Hence the common multiples of 12 and 16 are 48, 96, ,… and their LCM is Two or more nonzero numbers always have a common multiple — just multiply the numbers together.

• LCM (Lowest Common Multiple)
• GCD and LCM calculator

But the product of the numbers is not necessarily their lowest common multiple. What is the general situation illustrated here?

Solution The LCM of 9 and 10 is their product The common multiples are the multiples of the LCM You will have noticed that the list of common multiples of 4 and 6 is actually a list of multiples of their LCM