# LCM of 21

The LCM of 21 and 24 is the smallest number among all the common multiples of 21 and 24. The first few multiples of 21 and 24 are (21, 42, 63, 84, 105, 126, 147,…) and (24, 48, 72, 96) , 120, 144,…)
21 and LCM of 24.

Similarly, what is the GCF for 21 and 3? The GCF of 3 and 21 is 3 .

What are the factors of 21? factors of 21

• 21: Factors 1, 3, 7 and 21.
• Negative factors of 21: -1, -3, -7 and -21.
• 21: 3, prime factors of 7
• Prime factorization of 21: 3 × 7 = 3 × 7.
• The sum of the factors of 21:32.

How do you solve for LCM? Find the LCM Using Prime Factorization Method

1. Find the prime factorization of each number.
2. Write each number as a product of primes, joining the primes vertically when possible.
3. Bring down the prime numbers in each column.
4. Multiply the factors to get the LCM.

What are the multiples of the second 21? The first 21 multiples of 10 are 21, 42, 63, 84, 105, 126, 147, 168, 189 and 210 . Every multiple of 21 is exactly divisible by 7 and appears in the table of 7, so every multiple of 21 is also a multiple of 7.

## And what is the greatest common factor of 21?

The GCF of 21 and 30 is the largest possible number which exactly divides 21 and 30 without any remainder.

GCF of 21 and 30.

So what is the greatest common factor of 3 and 15x? The GCF of 3 and 15 is 3 .

What goes evenly in 21? Factors of 21: 1, 3, 7, 21 .

#### What is the GCF of 9 and 21?

Answer: GCF of 9 and 21 is 3 .

How do you make 21? We know that multiplying 1 by 21 gives 21, so they are both factors. 2 is not a factor of 21, because we cannot multiply it by any other whole number. 21.3 is a factor of 21, because it multiplies by 7 to make 21. So the factors of 21 are 1, 3, 7 and 21 .

What does LCM stand for in Mathematics?

Definition of Common Multiple

1: The smallest common factor of two or more numbers.

Is 21 a multiple of 3 or not? The first ten multiples of 3 are listed below: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30. … are 7, 3, 21 and 42.

#### Why is 21 a prime number?

Is 21 a prime number? …numbers 21 1, 3, 7, 21. is divisible by . For a number to be classified as a prime number, it must have exactly two factors. Since 21 has more than two factors, i.e. 1, 3, 7, 21, it is not a prime number.

What is a multiple of 21?

Solution: The first 21 multiples of 10 are 21, 42, 63, 84, 105, 126 , 147, 168, 189 and 210.

What is the HCF of 9 and 21? Answer: HCF of 9 and 21 is 3 .

What is the LCM of 21 and 26? The least common factor of 21 and 26 is 546 .

#### What is the GCF of 21 and 9?

Answer: GCF of 9 and 21 is 3 .

How do you calculate GCF? Here’s how to find the GCF of a set of numbers using prime factors:

1. List the prime factors of each number.
2. Circle each common prime factor – that is, every prime factor that is a factor of every number in the set.
3. Multiply all rounded numbers. The result is GCF.

How many factors does 24 have?

The factors of 24 are 1, 2, 3, 4, 6, 8, 12, 24. Therefore, 24 has 8 factors .

How do you write 21 divided by 3? When you divide 21 by 3 you get 7 . We can write this as: 21/3 = 7.

#### How much do you add to 21 to make it the answer to a prime number?

Since 2 is the only even prime number, it must be such that 2 + = 19 is the only sum of two prime numbers equal to 21.

What is the greatest common factor of 9 3 and 21? As you can see when you list the factors of each number, 3 is the largest number into which 3, 9 and 21 divide.

How do you find the greatest common factor?

To find the GCF of a set of numbers, list all the factors of each number . The largest factor that appears in each list is GCF. For example, to find the GCF of 6 and 15, first list all the factors of each number. Because 3 is the largest factor that appears in both lists, 3 is the GCF of 6 and 15.

How do you find HCF? The HCF of two or more numbers is the highest common factor of the given numbers. This is obtained by multiplying the common prime factors of the given numbers by .