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Q&A #688


Math strategies for approximation

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From: Marielouise (for Teacher2Teacher Service)
Date: Oct 26, 1998 at 21:01:59
Subject: Re: Math strategies for approximation

I do not know of any website that you can contact on this subject. However,
have you considered putting the number on a numberline? For example, round
56 to the nearest 10. Since 56 is located between 50 and 60, have the
children find the difference to 50 from 56 and from 60 to 56. There are 6
spaces from 50 to 56 and 4 spaces from 56 to 60. Always take the smallest
number. Therefore 56 rounds to 60 as the nearest ten.

Depending upon the age of the students, have them always choose the higher
number when the difference is the same. For example, 65 is between 60 and
70. It is 5 away from both 60 and 70. Since 70 is larger than 60, 65 rounds
to 70 as the nearest ten.

I hope that this has helped you.

-Marielouise, for the Teacher2Teacher service

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