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Q&A #2995


Multiplying and Dividing 2- and 3-digit numbers

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From: Marielouise (for Teacher2Teacher Service)
Date: Feb 02, 2000 at 17:03:42
Subject: Re: Multiplying and Dividing 2- and 3-digit numbers

I found Mathemagic listed in the Cuisenaire-Dale Seymour Publications Middle
School Catalog  (800)-237-0338.   The write up on the book is:

"Fourty-four classic lessons on math topics that seem to have mysterious
solutions.  Students find the "secrets" to the solutions of problems and
activities that explore logic and lateral thinking, number patterns, and
more."  It is 48 pages and costs $10.50  (#YA01724)

This might be what was suggested.

With your other problem:  have you ever considered multiplying by using a
matrix.  In this case a 2 x 2 set of boxes.  On the top row you would put one
number broken down in hundreds, tens and units.  On the side column you would
put the other.

Consider:   451 x 36

		400 + 50 + 1

30        *    *    *

6         *    *    *

You would find the product of each of the numbers to get the *.  Then add up
all of the stars.  This method is used frequently in algebra when kids first
start multiplying polynomials.

-Marielouise, for the Teacher2Teacher service

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