Speed Maths
Join Date: Oct 2006
Location: The Netherlands
Posts: 40
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I found this one very useful:
Speed Mathematics: Secret Skills for Quick Calculation
here is the linky for amazon...
Amazon.com: Speed Mathematics: Secret Skills for Quick Calculation: Bill Handley: Books
LG
Speed Mathematics: Secret Skills for Quick Calculation
here is the linky for amazon...
Amazon.com: Speed Mathematics: Secret Skills for Quick Calculation: Bill Handley: Books
LG