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Some math problems cannot be solved exactly in closed form:
• 
• quintic  https://www.wikiwand.com/en/Niels_Henrik_Abel
• function defined only by Taylor series
• geodesic dome smoother than the www.CorwinWmC.com\ \icosahedron.jpg 
    http://math.iit.edu/~mccomic/420/presentations/GeodesicSolids.pdf
• 
• three dimensional   catenary dome
• series solution for differentiaal equation e.g. ink dye diffusion in a porous capillary tube
• alternate least squares curve fit without inverting a matrix

The concepts can be practiced, like declaring variables , iterative processes, 
assigning values, ... .  Also Tex, MathML and asciiMath expressions can be developed.

These problems could supported on line without any installation of more plugins, apps, software, 

 minimum 

 fibonacci 

 plunker 

 fraser 

maybe:
http://rivetsjs.com/
https://underscorejs.org/test/
angular from  google
jQuery is by far the most popular library

 practice Tex expressions 
 practice TeX,MathML,asciimath 

•• ref:

https://developer.mozilla.org/en-US/docs/Web/JavaScript
https://en.wikipedia.org/wiki/JavaScript
https://en.wikipedia.org/wiki/Comparison_of_JavaScript-based_web_frameworks
https://en.wikipedia.org/wiki/List_of_JavaScript_libraries
https://www.wikiwand.com/en/List_of_JavaScript_libraries
https://www.wikiwand.com/en/History_of_calculus
https://www.tuhh.de/MathJax/test/examples.html

© (c) © 2021 William C. Corwin