Title: Regarding 13*54
Product review: First, a great book. I'm enjoying putting some of these methods to use!Second, in response to Nehal from 4/7/05:"But what happens when we want to multiply 13 x 54? In this case, we would like to start out with 10 (for 13) and 50 (for 54) giving us 10 x 50 = 500. In other words, we use 2 Reference Numbers: 10 and 50. Next, we make the corrections from here."13*54Use 10 as the reference number for both. Mentally write+3 +44over the 13 and 54 respectively.Gives54 + 3 = 57, and 57 * 10 = 570so 570 +44 * 3 = 120 + 12 = 132so the answer to 13*54 = 570 + 100 + 32 = 670 + 30 + 2 = 702Sure, problems in general get more difficult as you stray from the reference number, that's a given, but it is no big deal.
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