Understanding Factors and Prime Factors of 20

The video tutorial explains how to find the factors of 20 using a systematic method. It starts by listing 1 and 20 as factors and then identifies all factors in between. The video also demonstrates finding prime factors using a factor tree, resulting in 2 squared times 5. The tutorial concludes with a summary of the factors and prime factors of 20.

What is the first step in finding the factors of a number according to the video?

• List all numbers up to the number itself.

• Start with 1 and the number as factors.

• Divide the number by 2.

• Use a calculator to find factors.

Which of the following is NOT a factor of 20?

• 5

• 4

• 6

• 10

How many factors does the number 20 have?

• 6

• 5

• 4

• 7

What method is used in the video to find the prime factors of 20?

• Prime number list

• Factor tree

• Division method

• Multiplication table

Which of the following is a prime factor of 20?

• 4

• 5

• 20

• 10

What is the prime factorization of 20 as shown in the video?

• 1 x 20

• 4 x 5

• 2 x 2 x 5

• 2 x 10