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Credits
graph interaction: geogebra
pictures found at:
weknowyourdreams.com
graphicloads.com
dragonhandbook.wiwia.com
https://www.rappad.co/rap/128322
http://www.mathgoodies.com/factors/prime_factors.html
http://www.cut-the-knot.org/Curriculum/Arithmetic/BTreeTesting.shtml
https://www.youtube.com/watch?v=1EO6rqtSTgU
http://mathlessons.about.com/od/fourthgradelessons/a/Lesson-Plan-Factor-Trees.htm
http://tmathfun.weebly.com/factor-tree/factor-trees
https://www.brainingcamp.com/lessons/pythagorean-theorem/manipulative.php
https://www.yamiechess.com/product/the-pythagoras-dragon/
https://www.pinterest.com/karengoldstein/order-of-operation/
http://mathworld.wolfram.com/Parenthesis.html
http://www.mathgoodies.com/glossary/term.asp?term=parentheses
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