## How do you write 21 as a product of prime factors?

Factors of 21

1. Factors of 21: 1, 3, 7 and 21.
2. Negative Factors of 21: -1, -3, -7 and -21.
3. Prime Factors of 21: 3, 7.
4. Prime Factorization of 21: 3 × 7 = 3 × 7.
5. Sum of Factors of 21: 32.

### How do you find the prime number of 21?

The number 21 is divisible by 1, 3, 7, 21. For a number to be classified as a prime number, it should have exactly two factors.

How do you write a number as a product of prime factors?

Writing a Product of Prime Factors When a composite number is written as a product of all of its prime factors, we have the prime factorization of the number. For example, we can write the number 72 as a product of prime factors: 72 = 2 3 ⋅ 3 2 . The expression 2 3 ⋅ 3 2 is said to be the prime factorization of 72.

What are the common factors of 7 and 21?

There are 2 common factors of 7 and 21, that are 1 and 7. Therefore, the greatest common factor of 7 and 21 is 7.

## What is the common multiple of 21?

The first 10 multiples of 21 are, 21, 42, 63, 84, 105, 126, 147, 168, 189 and 210. Each multiple of 21 is entirely divisible by 7 and occurs in the table of 7, hence, each multiple of 21 is also the multiple of 7.

### What are the factors of 15 and 21?

GCF of 15 and 21 is the largest possible number that divides 15 and 21 exactly without any remainder. The factors of 15 and 21 are 1, 3, 5, 15 and 1, 3, 7, 21 respectively. There are 3 commonly used methods to find the GCF of 15 and 21 – long division, Euclidean algorithm, and prime factorization.

What is 48 as a product of primes?

The number 48 expressed as a product of its prime factors is 2 x 2 x 2 x 2 x 3.

What is 20 as a product of primes?

Since 2 is prime, the prime factorization of 20 is 2 * 2 * 5 .

## What is the LCM of 36 and 24?

72
Answer: LCM of 24 and 36 is 72.

### How are the prime factors of 160 calculated?

160 is divisible by the prime number 2 which results in 80. The same step can be applied 4 more times and the resultant value will be 5. The result 5 cannot be divided any further as it is a prime number. Hence the prime factors of 160 are 2, 2, 2, 2, 2, 5.

How to calculate Express 160 in factor tree?

Divide 160 by 2 as many times as you can to get 80×2, 40x2x2, 20x2x2x2, 10x2x2x2x2, 5x2x2x2x2x2. Then re-write your answer so that it is 5×2^5. If you’re struggling to divide by 2 and keep track of how many times you have divided, use a factor tree to help you visualise it more.

How is the prime factorization of an integer determined?

The prime factorization of a positive integer is a list of the integer’s prime factors, together with their multiplicities; the process of determining these factors is called integer factorization. Type the number in the input box below to find the prime factors of that number.

## How do you create a prime factor tree?

Creating a factor tree involves breaking up the composite number into factors of the composite number, until all of the numbers are prime. In the example below, the prime factors are found by dividing 820 by a prime factor, 2, then continuing to divide the result until all factors are prime.