Draw a number line and show all numbers that …
… are between 1 and 20 and have exactly 4 factors
That was prime factorisation.
But if you use all numbers 1 ÷ 20 then:
6
1 , 2 , 3 , 6
8
1 , 2 , 4 , 8
10
1 , 2 , 5 , 10
14
1 , 2 , 7 , 4
you forgot 15
Hey bros! Wanted to shout out some of you epic viewers!
Hey there gamers
To find the numbers between 1 and 20 that have exactly 4 factors, we need to determine which numbers have a total of 4 factors including 1 and the number itself.
Here's how you can draw a number line to show these numbers:
1. Draw a horizontal line and label it with the numbers from 1 to 20.
2. Start with the number 2, as 1 is not a prime number and has only 1 factor.
3. Identify the numbers between 1 and 20 that have exactly 4 factors. To do this, consider the prime factorization of each number.
- A number that has the form of a^3, where 'a' is a prime number, has exactly 4 factors. For example, 2^3 = 8, so 8 is one of the numbers.
- A number that has the form of a * b, where both 'a' and 'b' are prime numbers, has exactly 4 factors. For example, 2 * 3 = 6, so 6 is another number.
4. Mark these numbers on the number line using dots or by writing the numbers themselves.
By following these steps, you will be able to draw a number line showing the numbers between 1 and 20 that have exactly 4 factors.
Just number 16.
16 = 2 ∙ 2 ∙ 2 ∙ 2