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From: lake@alberta
Newsgroups: net.math
Subject: Re: Simple Division Properties
Message-ID: <440@alberta.UUCP>
Date: Mon, 29-Aug-83 22:10:15 EDT
Article-I.D.: alberta.440
Posted: Mon Aug 29 22:10:15 1983
Date-Received: Wed, 31-Aug-83 20:54:13 EDT
References: <166@pyuxn.UUCP>
Organization: U. of Alberta, Edmonton, AB, Canada
Lines: 9

A simple trick for squaring a two-digit number ending in a 5 is to
multiply the 10's digit by one plus itself and then append '25' to
the end of the product.

e.g.  75*75 can be calculated by multiplying (7+1)*7=56 and appending 25
to 56, so the product is 5625.

		  Rob Lake	University of Alberta
		alberta!lake	  Edmonton, Alberta