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Because you will see that the sum or difference is close to your estimate. If it isn't that close, round the number you're estimating to the nearest compatible number and find the sum or difference

Sum = Addition

Difference = Subtraction

Product = Multiplication

Quotient = Division

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Wiki User

11y ago
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Anonymous

Lvl 1
3y ago

Because you should always guess first and you don’t have to be right

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Anonymous

Lvl 1
3y ago
iiiii

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Anonymous

Lvl 1
3y ago

So that you can see if your answer is close to the actual answer

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Anonymous

Lvl 1
3y ago

No you can check your awnser

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