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Estimating Numbers (Introduction)
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Estimating provides a quick and easy answer when
an exact answer is not necessary. Estimation also
allows you to check the reasonableness of an answer
(does the answer make sense).

To estimate a number, you first have to round the
number then do the required operation.
Example: Tyler wants to go to the movies. Train fare
there and back is $11.50 and the admission fee is
$16.74. About how much money does Tyler need?
Estimate the amount she will need by rounding each
amount to the nearest ten. Then add.
Tyler will need about $27.70 which is pretty close the
actual amount.