# What are all the factors of 72?

The factors are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72.

[I divide 72 by 2 because I can see it is divisible by 2; this gives me the next pair.]

[The number five is the next to be checked, but 72 is not divisible by five. I usually write a number before I check, so I cross out the ones that don't apply.]

[72 cannot be divided by 7]

[Is that clear? Any factor of 72 greater than 9 must be multiplied by something less than 8 to get 72. But we've checked all the numbers up to and including 8. So we're finished.] [And that's all. 9 and the factors that are greater than 9 are already written on the right in the list of pairs above.]

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The factors of 72 are:

1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72

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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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