# What are all the greatest common factors of 36 and 90?

Here's a way to find the GCF without using prime factors

Instead of finding the prime factors of the two numbers, ~ make a list of ALL the factors of each number ~ then pick the largest ("greatest") one they have in common.

To find ALL the factors of a number: ~ Start by factoring by 1 and writing the factors down. ~ Then factor by 2, then by 3, then by 4, and so on. ~ If a number will not go in evenly, it is not a factor, so skip it and go to the next number. ~ When the factor pairs start to repeat, you are done.

The factors that 36 and 90 have in common are: 1, 2, 3, 6, 9, 18 So 18 is the greatest common factor .........................................

This technique of listing all possible factors (instead of prime factors) comes in handy for various applications. For one thing, there's no chance you will miss a factor.

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Common factors:

There can be several common factors, but there is only one Greatest Common factor.

Write 36 and 90 as the product of their prime factors.

As for all the common factors, it is probably easiest to write all the factors of 36 and then select which are factors of 90 as well.

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There is only one *greatest common factor* of 36 and 90 which is 18.

There are also a number of common factors including 1, 2, 3, 6, 9, 18.

The smallest prime numbers (prime numbers 2, 3, 5, 7, 11, 13, 17, 19) should be divided into each of the other given numbers to find the greatest common factor (GCF), which is the largest number that will divide into all of the given numbers.

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G C F 18

It’s also called Greatest Common Divisor G C D

To determine 36, 90's G C F:

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The greatest common factors (GCF) of 36 and 90 are 6.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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