Factor trees are useful when you need to see the factors of a number. It is sometimes easier to see everything spread out.
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To find the factor tree for 193, you start by determining the prime factors of 193. Since 193 is a prime number itself, the factor tree for 193 would simply consist of the number 193 at the top, as it cannot be broken down further into smaller prime factors. Therefore, the factor tree for 193 would just be a single branch with 193 as the prime factor.
Factor tree of 40: 40 20,2 10,2,2 5,2,2,2
Use a factor tree. 72 36,2 18,2,2 9,2,2,2 3,3,2,2,2
Use a factor tree. 36 18,2 9,2,2 3,3,2,2
Here is a factor tree of eight: 8 / \ 4 2 / \ 2 2