|تنسيق = PDF| مسار الأرشيف = https://web.archive.org/web/2020062122070420200621220711/https://ia902205.us.archive.org/33/items/ERIC_ED327701/ERIC_ED327701.pdf | تاريخ الأرشيف = 21 يونيو 2020 }}</ref><ref>[https://books.google.com/books?id=ZUfVZELlrMEC&pg=PA321&lpg=PA321&dq=Condition+Number+Rule+of+Thumb&source=bl&ots=kMuMoeATcB&sig=22t9ml1TcXKbve-nAkkTJ-qAf1g&hl=en&ei=A5abTIvGOsaMnQe_17TpDw&sa=X&oi=book_result&ct=result&resnum=3&ved=0CBsQ6AEwAg#v=onepage&q=Condition%20Number%20Rule%20of%20Thumb&f=false Numerical Mathematics and Computing, by Cheney and Kincaid]. {{Webarchive|url=https://web.archive.org/web/20190119212422/https://books.google.com/books?id=ZUfVZELlrMEC&pg=PA321&lpg=PA321&dq=Condition+Number+Rule+of+Thumb&source=bl&ots=kMuMoeATcB&sig=22t9ml1TcXKbve-nAkkTJ-qAf1g&hl=en&ei=A5abTIvGOsaMnQe_17TpDw&sa=X&oi=book_result&ct=result&resnum=3&ved=0CBsQ6AEwAg |date=19 يناير 2019}}</ref><ref>{{استشهاد ويب |مسار= http://www.ligo.caltech.edu/~vsanni/ph3/SignificantFiguresAndMeasurements/SignificantFiguresAndMeasurements.pdf |تنسيق= PDF |مسار أرشيف= https://web.archive.org/web/20130618184216/http://www.ligo.caltech.edu/~vsanni/ph3/SignificantFiguresAndMeasurements/SignificantFiguresAndMeasurements.pdf |تاريخ أرشيف= June 18, 2013 |عنوان= Measurements and Significant Figures (Draft) |الأول= Virgínio |الأخير= de Oliveira Sannibale |سنة= 2001 |عمل= Freshman Physics Laboratory |ناشر= California Institute of Technology, Physics Mathematics And Astronomy Division }}</ref>
* يعتمد عدد الأرقام المعنوية في العدد المعنوي على أصغر تدريج في أداة القياس، فكلما كان التدريج أدق أو أصغر كانت الأعداد المعنوية قليلة.
