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# What are the 8 prime numbers under 20?

## What are the 8 prime numbers under 20?

There are 8 prime numbers under 20: 2, 3, 5, 7, 11, 13, 17 and 19.

## What are prime numbers up to 20?

Correct answer: The prime numbers between 1 and 20 inclusive are 2, 3, 5, 7, 11, 13, 17, 19 – eight total. Since 1 is neither prime nor composite, this leaves 11 composite numbers.

What are 8 prime factors?

Facts – Factors of 8

• Factors of 8 – 1, 2, 4 and 8.
• Prime factorisation – 2 x 2 x 2.
• Prime factor of 8 – 2.
• Pair factors – (1,8) and (2,4)
• Sum of factors of 8 – 15.

### How many factors of 8 are there?

4 factors
Factors of 8 are the list of integers that can be evenly divided into 8. It has a total of 4 factors of which 8 is the biggest factor and the positive factors of 8 are 1, 2, 4, and 8. The Pair Factors of 8 are (1, 8) and (2, 4) and its Prime Factors are 1, 2, 4, 8.

### What are the Prime Factors of 7 and 8?

Prime Factors

• Prime Factors for 7: 7.
• Prime Factors for 8: 2, 2, and 2.

What are the prime numbers less than 20?

Answer and Explanation: The prime numbers that are less than 20 are: 2, 3, 5, 7, 11, 13, 17, and 19.

#### How do you calculate prime numbers?

Simple division with pencil and paper can also be a good method for teaching young learners how to determine prime numbers. First, divide the number by two, then by three, four, and five if none of those factors yields a whole number.

#### What are the largest prime numbers?

Euclid proved that there is no largest prime number, and many mathematicians and hobbyists continue to search for large prime numbers. Many of the largest known primes are Mersenne primes, numbers that are one less than a power of two. As of December 2018, the eight largest known primes are Mersenne primes.

How do you calculate prime factorization?

The prime factors of a number are all the prime numbers that, when multiplied together, equal the original number. You can find the prime factorization of a number by using a factor tree and dividing the number into smaller parts. You can begin by finding a prime number and factoring out that number, then continuing on in that manner.