Q&A #688

Teachers' Lounge Discussion: Math strategies for approximation

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From: T. Gibbs

To: Teacher2Teacher Public Discussion
Date: 2000010621:00:26
Subject: rounding-approximating

I teach third grade.  I made two large hands.  On the left hand I put
0-4 on left finger tips, and 5-9 on the right finger tips.  I label
LEFT--LEAVE IT HAND, and RIGHT--RAISE IT HAND.	When explaining to
students to round off to a particular place, I tell them that that is
the target digit.  Underline it.  The digit to the right (circle it)
is the "bossy neighbor".  Look at the hands to see where the "bossy
neighbor" is.  If it is on the left hand the target is left as is and
everything to the right becomes a zero.  If the "bossy neighbor" is on
the right hand, the target raises to the next digit, and everything to
the right becomes a zero.  This has worked very successfully.  

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