Teacher2Teacher 
Q&A #1154 
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From: Ganeshan <ganeshan@nj.rr.com> To: Teacher2Teacher Public Discussion Date: 2001102418:35:30 Subject: Front End Estimation After many attempts with my daughters math book, her class work and her discussions with her teacher, I got nowhere with this Front End estimation problems. As a concept it is clear what it is all about and it is obvious how it can be helpful. The confusion is, what level of accuracy (how many digits places, extent of rounding, etc) is required and never is it mentioned along with the problems and exercises. The real issue here is what my daughter asks  If such problems appear in a test, to what accuracy (or place digits) should I do this ?  Clearly, claiming that "estimates can never be wrong" is wrong in this context, as only one specific value will be accepted as the right answer. By doing exercises with such incomplete requirements, we end up confusing the kids and discourage them from the fun of math. I agree very well the PTA member referred at the start of this thread, that accurate computations are enough at the elementary level. Only after they have mastered clear, accurate and straight methods and exercises, with large numbers, extensively should approximation and estimation techniques be taught (may be in middle school). Even then specifying required level of accuracy is a must.
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