# How do you list all the prime numbers between 80 and 90?

You evaluate the 5 odd numbers from 81 to 89.

The highest prime you test for is smaller/equal to the square root of the number, so we didn't need to look for the next prime 11. If the number had a factor of 11 or higher, it also had a factor smaller than 11, and we would have discovered that.

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We need only take into account factors less than the square roots because factors are always considered in pairs.

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To list all the prime numbers between 80 and 90, you would check each number in the range individually to see if it is divisible only by 1 and itself. The prime numbers in this range are: 83 and 89.

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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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