Teacher2Teacher Q&A #1154

Teachers' Lounge Discussion: Front End Estimation

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From: Gail

To: Teacher2Teacher Public Discussion
Date: 2000101213:04:02
Subject: Re: Front-end estimation

>When you are using front-end estimation in addition, how many places do you estimate. + 357,289 > > 238,499 > > _________ > > 500,000 > > or 580,000 > > 595,000 When I teach my fifth graders to use front end estimation, I am trying to give them a check and easy way to get a "ballpark" answer. So I ask them to look at a problem like the one you shared above, and think, "3 hundred thousand plus 2 hundred thousand is 5 hundred thousand. I have about another hundred thousand if I look at the remainder of the two numbers, since 57 thousand is almost 60 thousand, and 38 thousand is almost 40 thousand. That means the answer is about 600,000. It is a great way to develop place value number sense, and a very quick way to find an estimated sum. Hope this answers your question. -Gail, for the Teacher2Teacher service

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