# What is the GCF of 210 and 252?

The following is one method for determining the GCF of two numbers:

The GCF is the smaller number if the remainder is zero.

If not, repeat with the remainder and the smaller number.

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If we only know the multiplication tables up to 12 x 12, we should be able to find the GCF fairly quickly in most situations.

Occasionally a larger number that is unknown to us may be included; this is one instance of that.

You can write all of the prime factors by mentally using factor trees.

It is beneficial to have a backup plan in place in the event that visual inspection fails to locate the GCF.

Write each number as the product of its prime factors to find the GCF (and the LCM).

This makes it abundantly evident that 42 is the common factor.

This format makes it simple to calculate the LCM if we need it: Add all the factors in each column, making sure not to count the same factors twice.

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The Greatest Common Factor (GCF) of 210 and 252 is 42.

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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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