Ms. Garcia Math
Estimate
Show/Hide
A number that is close (not exact) to the real value.
Example: Estimate the number of bacteria on a sample
Rounding Numbers
Show/Hide
Change an exact number to an easy to use number that is close to the exact number
e.g. Round $19.95
to the nearest Dollar:
$20
(1) Underline the number that is in the place that you want to round
(2) Look at the number on the right of the underlined number.
* If it’s 5 or more, add one more to the underlined number.
* If it’s 4 or less, keep the underlined number the same.
(3) Numbers on the left stay the same and numbers on the right became zeros.
e.g. Round to the nearest hundreds 3,
2
78 =
3, 300
Front-end rounding
Show/Hide
For larger numbers, round off to the first or second digit from the front
e.g. $ 1,496.70 to
$ 1,500