What is a factor tree of 640?

Answer 1

Choose a factor pair of 640 and then factor pairs of each resulting number that is not prime until you have reduced 640 to prime numbers.

640
10 x 64
2x5 x 8x8
_ _ 2x4 2x4
_ _ _ 2x2 _ 2x2

So, the prime factorization of 640 is 2 x 5 x 2 x 2 x 2 x 2 x 2 x 2, which is 2 x 2 x 2 x 2 x 2 x 2 x 2 x 5 when reordered in numerical order. It can also be written in index form (in other words, using exponents) 27 x 5.

Answer 2

The prime factorization of 640 is 2 x 2 x 2 x 2 x 2 x 2 x 2 x 5

Answer 3

The prime factorization of 340 is 2 x 2 x 5 x 17.

Answer 4

6400 = 80*80

Answer 5

480 = 2 x 2 x 2 x 2 x 2 x 3 x 5