Asked by Anonymous

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!
Answered by HAPPY FACE :)
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.

Answered by Anonymous
attn(happy face)thank you!!
Answered by math
ashton broke apart a number into 30+7. what number did she start with?
Answered by Anna
use any methond to eastimate each difference
Answered by Anna
use any method estimate 667-651
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