# How do you estimate #1087times21# by rounding?

First, round off the given numbers. Keep in mind that, generally speaking, the degree of rounding will determine how close the estimated product will be to the actual product; that is, the estimated value will typically be closer to the actual value if we round off to the nearest tens, but it will also be easier to compute the estimated value if we round off to the nearest hundreds or even thousands.

We'll round 21 and 1087 to the closest ten.

Rounding off 1087 to the closest hundreds and 21 to the closest tens again, we get

Rounding down 1087 to the closest thousand and 21 to the closest tens again, we get

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To estimate 1087 times 21 by rounding, you can round each number to the nearest ten or hundred and then multiply the rounded numbers. For example:

Round 1087 to the nearest ten: 1090 Round 21 to the nearest ten: 20

Then multiply the rounded numbers: (1090 \times 20 = 21,800)

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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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