Question

Find the prime factorisation of the following numbers using the factor tree method.
81​

Answer 1

Answer:

3

×

3

×

3

×

3

Explanation:

Prime factorization is where we take a number, such as 81, and break it down into its prime factors.

For instance,  

9

×

9

=

81

.

9 is a factor of 81. But 9 isn't prime.  

3

×

3

=

9

. 3 is prime.

And so we can use that to rewrite what we started with:

9

×

9

=

3

×

3

×

3

×

3

=

81

The red is the prime factorization.

Step-by-step explanation:

Answer 2

Answer:

3×3×3×3 = 9×9 = 81

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