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

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You cannot. 3.99 is 3.99 and no estimation is going to check that. Similarly with 0.84

Q: How could you use estimation to check3.99 and 0.84?

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Use estimation when an approximate answer is acceptable.

Estimation is a quick of working out roughly what the answer is

4 x 0.8 = 3.2

precision

When a quick and approximate answer will suffice.

Related questions

Use estimation when an approximate answer is acceptable.

Estimation is a quick of working out roughly what the answer is

4 x 0.8 = 3.2

front end estimation means to use only the whole number part of the decimal. we only use whole numbers to do front end estimation

You could estimate 60/3, but 57/3 is 29.

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

precision

by comparing the colours or the amount of precipitate

You can estimate when an exact answer is not needed.

estimation

Estimation population

When a quick and approximate answer will suffice.