What are the Factors of 42?

The following are the different types of factors of 42:

• Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42

• Sum of Factors of 42: 96

• Negative Factors of 42: -1, -2, -3, -6, -7, -14, -21, -42

• Prime Factors of 42: 2, 3, 7

• Prime Factorization of 42: 2^1 × 3^1 × 7^1

There are two ways to find the factors of 42: using factor pairs, and using prime factorization.

Factor pairs of 42 are any two numbers that, when multiplied together, equal 42. The question to ask is “what two numbers multiplied together equal 42?” Every factor can be paired with another factor, and multiplying the two will result in 42.

To find the factor pairs of 42, follow these steps:

Step 1:

Find the smallest prime number that is larger than 1, and is a factor of 42. For reference, the first prime numbers to check are 2, 3, 5, 7, 11, and 13. In this case, the smallest factor that’s a prime number larger than 1 is 2.

Step 2:

Divide 42 by the smallest prime factor, in this case, 2:

42 ÷ 2 = 21

2 and 21 will make a new factor pair.

Step 3:

Repeat Steps 1 and 2, using 21 as the new focus. Find the smallest prime factor that isn’t 1, and divide 21 by that number. In this case, 3 is the new smallest prime factor:

21 ÷ 3 = 7

Remember that this new factor pair is only for the factors of 21, not 42. So, to finish the factor pair for 42, you’d multiply 2 and 3 before pairing with 7:

2 x 3 = 6

Step 4:

Repeat this process until there are no longer any prime factors larger than one to divide by. At the end, you should have the full list of factor pairs.

Here are all the factor pairs for 42:

(1, 42), (2, 21), (3, 14), (6, 7)

So, to list all the factors of 42: 1, 2, 3, 6, 7, 14, 21, 42

The negative factors of 42 would be: -1, -2, -3, -6, -7, -14, -21, -42

To find the Prime factorization of 42, we break down all the factors of 42 until we are left with only prime factors. We then express n as a product of multiplying the prime factors together.

The process of finding the prime factorization of 42 only has a few differences from the above method of finding the factors of 42. Instead of ensuring we find the right factor pairs, we continue to factor each step until we are left with only the list of smallest prime factors greater than 1.

Here are the steps for finding the prime factorization of 42:

Step 1:

Find the smallest prime number that is larger than 1, and is a factor of 42. For reference, the first prime numbers to check are 2, 3, 5, 7, 11, and 13. In this case, the smallest factor that’s a prime number larger than 1 is 2.

Step 2:

Divide 42 by the smallest prime factor, in this case, 2

42 ÷ 2 = 21

2 becomes the first number in our prime factorization.

Step 3:

Repeat Steps 1 and 2, using 21 as the new focus. Find the smallest prime factor that isn’t 1, and divide 21 by that number. The smallest prime factor you pick for 21 will then be the next prime factor. If you keep repeating this process, there will be a point where there will be no more prime factors left, which leaves you with the prime factors for prime factorization.

So, the unique prime factors of 42 are: 2, 3, 7

Practice your factoring skills by exploring how to factor other numbers, like the ones below:

Factors of 8 - The factors of 8 are 1, 2, 4, 8

Factors of 65 - The factors of 65 are 1, 5, 13, 65

Factors of 110 - The factors of 110 are 1, 2, 5, 10, 11, 22, 55, 110

Factors of 49 - The factors of 49 are 1, 7, 49