What are the Factors of 90?

The following are the different types of factors of 90:

• Factors of 90: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90

• Sum of Factors of 90: 234

• Negative Factors of 90: -1, -2, -3, -5, -6, -9, -10, -15, -18, -30, -45, -90

• Prime Factors of 90: 2, 3, 5

• Prime Factorization of 90: 2^1 × 3^2 × 5^1

There are two ways to find the factors of 90: using factor pairs, and using prime factorization.

Factor pairs of 90 are any two numbers that, when multiplied together, equal 90. The question to ask is “what two numbers multiplied together equal 90?” Every factor can be paired with another factor, and multiplying the two will result in 90.

To find the factor pairs of 90, follow these steps:

Step 1:

Find the smallest prime number that is larger than 1, and is a factor of 90. 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 90 by the smallest prime factor, in this case, 2:

90 ÷ 2 = 45

2 and 45 will make a new factor pair.

Step 3:

Repeat Steps 1 and 2, using 45 as the new focus. Find the smallest prime factor that isn’t 1, and divide 45 by that number. In this case, 3 is the new smallest prime factor:

45 ÷ 3 = 15

Remember that this new factor pair is only for the factors of 45, not 90. So, to finish the factor pair for 90, you’d multiply 2 and 3 before pairing with 15:

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 90:

(1, 90), (2, 45), (3, 30), (5, 18), (6, 15), (9, 10)

So, to list all the factors of 90: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90

The negative factors of 90 would be: -1, -2, -3, -5, -6, -9, -10, -15, -18, -30, -45, -90

To find the Prime factorization of 90, we break down all the factors of 90 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 90 only has a few differences from the above method of finding the factors of 90. 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 90:

Step 1:

Find the smallest prime number that is larger than 1, and is a factor of 90. 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 90 by the smallest prime factor, in this case, 2

90 ÷ 2 = 45

2 becomes the first number in our prime factorization.

Step 3:

Repeat Steps 1 and 2, using 45 as the new focus. Find the smallest prime factor that isn’t 1, and divide 45 by that number. The smallest prime factor you pick for 45 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 90 are: 2, 3, 5

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

Factors of 41 - The factors of 41 are 1, 41

Factors of 26 - The factors of 26 are 1, 2, 13, 26

Factors of 97 - The factors of 97 are 1, 97

Factors of 109 - The factors of 109 are 1, 109