The Mudcat Café TM
Thread #59418   Message #1382485
Posted By: Teresa
19-Jan-05 - 03:04 PM
Thread Name: BS: The Mother of all BS threads
Subject: RE: BS: The Mother of all BS threads
Oh, was that part of "Schoolhouse Rock" ... that five song? I haven't heard that in ages, but my mom got me the record, and I played it over and over.

On it, the way I learned the nines is this:   except on one times nine, the result in the tens is always one digit less than the factor, as in (six times nine is *fifty*-four, seven times nine is *sixty*-three) and notice that the digit in the ones column decreases by one.

I don't know what I'd do if I didn't have these mnemonic devices. :)