Posted by **Anonymous** on Wednesday, October 20, 2010 at 7:17pm.

front end estimation to estimate the sum...like..436+517= ~~~~~~also we have some problems that say use rounding to estimate the sum...like..236+710=....DO WE DO BOTH OF THESE THE SAME WAY??? solve then estimate??? my child has been out from school for a few days sick and missed this. Thanks!

- 3rd grade math -
**HAPPY FACE :)**, Wednesday, October 20, 2010 at 7:32pm
front end estimation: 436+517=400+500=900

rounding: 236+710= 200+700=900

front end estimation:

* Add the digits of the two highest place values

* Insert zeros for the other place values

* Example 1: 4496 + 3745 is estimated to be 8100 by front end estimation (i.e. 4400 + 3700).

* Example 2: 4496 + 745 is estimated to be 5100 by front end estimation (i.e. 4400 + 700).

rounding:

* Rounding makes numbers that are easier to work with in your head.

* Rounded numbers are only approximate.

* An exact answer generally can not be obtained using rounded numbers.

* Use rounding to get a answer that is close but that does not have to be exact.

How to round numbers

* Make the numbers that end in 1 through 4 into the next lower number that ends in 0. For example 74 rounded to the nearest ten would be 70.

* Numbers that end in a digit of 5 or more should be rounded up to the next even ten. The number 88 rounded to the nearest ten would be 90.

- 3rd grade math -
**Anonymous**, Wednesday, October 20, 2010 at 8:54pm
attn(happy face)thank you!!

- 3rd grade math -
**math**, Monday, October 25, 2010 at 9:39am
ashton broke apart a number into 30+7. what number did she start with?

- 3rd grade math -
**Anna**, Wednesday, November 21, 2012 at 12:27am
use any methond to eastimate each difference

- 3rd grade math -
**Anna**, Wednesday, November 21, 2012 at 12:30am
use any method estimate 667-651

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