Understanding Factors and Prime Factorization of 81

The video tutorial explains how to find the factors of 81 by starting with 1 and the number itself, then checking each number in between to see if it divides evenly into 81. The factors identified are 1, 3, 9, 27, and 81. The tutorial then demonstrates the prime factorization of 81, showing that it is 3 to the power of 4. The video concludes with a call to action to subscribe for more math and science content.

What is the first step in finding the factors of a number like 81?

• Divide the number by 2

• Multiply the number by itself

• List all even numbers

• Start with 1 and the number itself

Which of the following numbers is a factor of 81?

• 2

• 5

• 9

• 4

How many times does 3 go into 81?

• 3 times

• 18 times

• 27 times

• 9 times

Which of the following is NOT a factor of 81?

• 8

• 27

• 3

• 1

What is the first prime factor of 81?

• 2

• 5

• 3

• 7

How can 81 be expressed using its prime factors?

• 2^4

• 7^3

• 3^4

• 5^2

What is the prime factorization of 81?

• 2 x 2 x 2 x 2

• 3 x 3 x 3 x 3

• 3 x 3 x 3

• 5 x 5 x 5