"Rule of Thumb
Measuring System" is a workbook developed to promote the understanding of the abstract concept of fractional measurement as opposed to simply learning the names of the lines on a traditional ruler.
Rule of Thumb Measuring System Phone: (812) 299 - 7507 Fax: (299) 3397 Email: pamszim@yahoo.com (Please type RULE OF THUMB ORDER on the Subject Space of Email)
