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4 x 0.8 = 3.2

Q: How could you use estimation to check the reasonableness of the quotient for 3.99 and 0.84?

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Estimate 3.99 as 4. The answer will be one less than 4 + 0.84

Suppose you are asked to evaluate a quotient like 923/462. You have several options. You could choose 900 and 500 as compatible numbers for the two given numbers and then your estimated quotient would be 900/500 = 1.8. Or You could choose 920 and 460 as the compatible numbers for them and then your estimated quotient would be 920/460 = 2.0. So the question is essentially, what compatible numbers did you pick and using them, what was the quotient. There is no correct answer to picking compatible numbers. Any estimation is a trade-off between simplicity and accuracy. Incidentally, a more accurate answer is 1.9978 (approx), but even that is not perfect!

Estimation enables you to obtain a rough answer using only mental maths. An approximate answer can sometimes be sufficient.

Ask a biologist;)

That depends to what degree you are estimating. It could be 3290, 3300, 3000...

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you could have done something wrong on the calculator !

Estimate 3.99 as 4. The answer will be one less than 4 + 0.84

That depends how precise the estimation needs to be. It could be 600000, but it could be 589714.

The reasonableness of conduct is a legal standard used to evaluate if someone acted in a way that an ordinary, prudent person would in similar circumstances. In a sentence, you could say "The court determined that the reasonableness of conduct in this case was questionable due to the lack of care taken by the defendant."

Suppose you are asked to evaluate a quotient like 923/462. You have several options. You could choose 900 and 500 as compatible numbers for the two given numbers and then your estimated quotient would be 900/500 = 1.8. Or You could choose 920 and 460 as the compatible numbers for them and then your estimated quotient would be 920/460 = 2.0. So the question is essentially, what compatible numbers did you pick and using them, what was the quotient. There is no correct answer to picking compatible numbers. Any estimation is a trade-off between simplicity and accuracy. Incidentally, a more accurate answer is 1.9978 (approx), but even that is not perfect!

Estimation enables you to obtain a rough answer using only mental maths. An approximate answer can sometimes be sufficient.

It could be 0.2 to one decimal place.

Ask a biologist;)

Use rounding and estimation to predict the approximate quotient of 285 รท 11.

That depends to what degree you are estimating. It could be 3290, 3300, 3000...

You could try estimation to get an idea of the magnitude of the answer.

there might be too many in the world to have an exact answer, but there could be an estimation.