The prime numbers

**between 20 and 30**is 23 , 29.Regarding this, how many composite numbers are between 30 and 40?

**20**,

**21**,

**22**,24,25,26,27,28,30,

**32**,

**33**,

**34**,35,

**36**,

**38**,

**39**,40.

How many prime numbers are between 20 and 50?

There are

**7 prime numbers**: 23, 29, 31, 37, 41, 43, 47.1

## What are the two prime numbers between 50 and 60?

Name the

**prime numbers between 50 and 60**: [53 and 59] Note that neither 51 nor 57 is**prime**because they are both divisible by 3. We know that because the sum of their digits (6 and 12) are divisible by 3.2

## Which number is the only even prime?

The only even prime number is

**2**. All other even numbers can be divided by**2**. If the sum of a number's digits is a multiple of**3**, that number can be divided by**3**. No prime number greater than 5 ends in a 5.3

## What is the mean of prime numbers between 20 and 30?

The

**prime numbers between 20 and 30**is 23 , 29.**Mean**of 23 and 29 = ( 23 + 29) / 2. = 52 / 2. = 26.4

## Why is the number 2 the only even prime?

**Two**is a

**prime**because it is divisible by

**only two**and one. All the other

**even numbers**are not

**prime**because they are all divisible by

**two**. That leaves

**only**the odd

**numbers**.

5

## How many prime numbers are between 20 and 50?

There are

**7 prime numbers**: 23, 29, 31, 37, 41, 43, 47.6

## How many prime numbers are between 40 and 60?

Explanation: A prime number is a number that is only divisible by 1 and the number itself (examples include 3,

**11**,**19**). The prime numbers between 40 and 60 are**41**,**43**,**47**,**53**, and**59**.7

## What are the prime numbers that are less than 20?

Answer and Explanation: The

**prime numbers**that are**less than 20**are: 1, 2, 3, 5, 7, 11, 13, 17, and 19.8

## What are the prime numbers between 20 and 40?

There are four

**prime numbers between 20 and 40**and they are 23, 29, 31, 37.9

## What are all of the prime numbers between 30 and 50?

There are 5. Just like that. If you need all the

**prime numbers from**1 to 100, well then here goes: 1,2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,51,53,59,61,67,71,73,79,83,89,91,97.10

## How many composite numbers are there between 20 and 30?

The composite numbers up to 150 are 4, 6, 8, 9, 10, 12,

**14**, 15, 16, 18, 20,**21**,**22**,**24**,**25**,**26**,**27**,**28**, 30, 32, 33, 34, 35, 36, 38, 39,**40**, 42, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98,11

## Why is 15 not a prime number?

For

**15**, the answer is: No,**15**is**not a prime number**. The list of all positive divisors (i.e., the list of all integers that divide**15**) is as follows: 1, 3, 5,**15**. To be**15**a**prime number**, it would have been required that**15**has only two divisors, i.e., itself and 1.12

## How many prime numbers are between 30 and 40?

Answer and Explanation: The prime numbers between 30 and 40 are:

**31**and**37**. To find this answer, you start with listing the factors of all numbers between 30 and 40. By looking at this chart, you can tell that there are**two prime numbers**, because**31**and**37**only have two factors.13

## What is the prime numbers from 1 to 20?

When a number has more than two

**factors**it is called a composite number. Here are the first few prime numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, etc.14

## What are all the prime numbers between 10 and 20?

Answer: The

**numbers**11 , 13 , 17 and 19 are**all prime numbers between 10 and 20**.15

## What are the prime factors of 20?

**20**is a composite number.

**20**= 1 x

**20**, 2 x 10, or 4 x 5.

**Factors of 20**: 1, 2, 4, 5, 10,

**20**.

**Prime factorization**:

**20**= 2 x 2 x 5, which can also be written

**20**= 2² x 5.

16

## Which is a prime number?

A

**prime number**is a whole**number**greater than 1 whose only factors are 1 and itself. A factor is a whole**numbers**that can be divided evenly into another**number**. The first few**prime numbers**are 2, 3, 5, 7, 11, 13, 17, 19, 23 and 29.**Numbers**that have more than two factors are called composite**numbers**.17

## How many thirds are there in five?

We can connect this to the algorithm for dividing fractions: and we can see that there are 2 wholes with

**3 thirds**in each whole, so there are thirds in . Because we want to know how many**two**-thirds there are, we have to make groups of thirds, or divide the number of thirds we have by . So there are**two**-thirds in 2.18

## What are the prime factors of 42?

The only way to write 42 as the product of primes (except to change the order of the factors) is 2 × 3 × 7. We call 2 × 3 × 7 the prime factorization of 42. It turns out that every counting number (natural number) has a

**unique**prime factorization, different from any other counting number.