We've open-sourced several other mostly-KA-specific parts of the site, including these:
https://github.com/Khan/khan-exercises
https://github.com/Khan/perseus
https://github.com/Khan/live-editor
Contributions are few and far between; good contributions are even more so. It hasn't been worth the time investment, unfortunately.
In MathML is a failed web standardKhan
khan-exercises
HTML2011–2016
Khan / khan-exercises · Archived
khan-exercises
A (deprecated) framework for building exercises to work with Khan Academy.
16Distinct people
37Mentions
0Explicit recommenders
1.7KGitHub stars
What to know before exploring
What it is
A (deprecated) framework for building exercises to work with Khan Academy.
GitHub
Where it is used
No documented product use was verified in the last source check.
What people are saying
No recommendation phrase was found in the indexed comments.
No classified warning is attached to this page. Read the discussions before treating silence as approval.
Also in these discussions
- khan/perseus · linked in 2 of the same discussions
Mentioned in the same Hacker News threads. That is not proof they are substitutes.
This week on Hacker News
Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 3:56:07 PM UTC.
No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.
Mentions over time
HN mentions by year37 dated mentions
Observed mentions: 2011-06-22 02:16:06 UTC to 2016-04-07 21:31:38 UTC.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| 2011 | 2011-01-01 00:00:00 UTC | 2012-01-01 00:00:00 UTC | 15 | 1 | 14 |
| 2012 | 2012-01-01 00:00:00 UTC | 2013-01-01 00:00:00 UTC | 14 | 0 | 14 |
| 2013 | 2013-01-01 00:00:00 UTC | 2014-01-01 00:00:00 UTC | 6 | 0 | 6 |
| 2014 | 2014-01-01 00:00:00 UTC | 2015-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2015 | 2015-01-01 00:00:00 UTC | 2016-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2016 | 2016-01-01 00:00:00 UTC | 2017-01-01 00:00:00 UTC | 1 | 0 | 1 |
From the project README
An excerpt from the repository, fetched Nov 13, 2026.
Read the project’s introduction
Khan Academy Exercises
Khan Academy has created a generic framework for building exercises. This framework, together with the exercises themselves, can be used completely independently of the Khan Academy application.
This repo consists of two parts:
Various HTML files that describe exercises.
A jQuery plugin for generating a usable, interactive, exercise from any of the HTML files.
Current Status
Khan Exercises is no longer used for development of new exercises at Khan Academy. We're always looking to improve the exercises that are currently built with Khan Exercises, but at this time we don't intend to add any new exercises. New exercises on Khan Academy are written by many content experts using Perseus and stored in our datastore as individual questions.
The bulk of our bug reports now go into Zen Desk where volunteers surface issues to KA developers, but we still process issues and PRs that come in through this repository. The goal is to keep high-quality bug reports and feature requests in this repository so awesome OSS developers who want to help KA have the tools do so.
If you're looking to contribute time, looking through our wiki is a good place to start. Questions should go into the issue tracker (we may set up gitter if there ends up being a high volume of questions).
Licensing
Copyright (c) 2015 Khan Academy
The exercise framework is MIT licensed.
The exercises are under a Creative Commons by-nc-sa license.
Using the Framework Locally
You need to serve the files from some sort of a server. You can't just open the files directly in a browser. For example:
cd khan-exercises
python -m SimpleHTTPServer # or python3 -m http.server
Now if you open your browser to http://localhost:8000 (or http://127.0.0.1:8000/) you should see the contents of the khan-exercises directory. Navigate to the exercises subfolder, and an HTML file under there to see an exercise.
More
If you're passionate about providing a free world-class education for anyone, anywhere and want to apply to be a full-time or intern software developer at Khan Academy, please do so.
Read the full README on GitHubWhat Hacker News says
37 sources1. If you're not passing the backbone models to React components, this sounds fine. backbone models as props ends up being really painful because of how mutable they are, and when we tried to manage that with mixins, it was buggy and caused problems (note: I'm not familiar with the actual mixin we used there and whether there was a better way to do it). Since most flux implementations are pretty stateful/mutable themselves, using mutable backbone models there, so long as you copy data out to pass to react views, seems safe. Though I'm excited long-term about the immutable flux implementations (https://github.com/rackt/redux)
2. We had a library originally written by Ben Alpert (now core react team) that handles all of our interactive svgs [1]. Since KA has a lot of legacy code there, and there hasn't been an immediate benefit to porting i
Read the rest
t (which would take a pretty significant time investment, on the [very roughly] order of a couple dev-months), this is still mutable jQuery/raphael code. There have been a lot of talks of eventually porting this to react, but the immediate need for it hasn't been there yet. However, I did write a React wrapper around much of this code which is used by newer interactive widgets [2].
[1]: https://github.com/Khan/khan-exercises/blob/master/utils/gra...
[2]: https://github.com/Khan/perseus/blob/master/src/components/g...
I like the idea and there is a real need for this kind of app, but I think that restricting to multiple choice and text input questions is a very bad choice. These types of questions are the legacy of computer-fill-in-the-circle-with-a-pencil technology from the old days.
The khan academy exercises framework[1] is doing some very interesting things on the "rich question" front. They have questions which can be answered by moving lines, matching expressions as well as entering rich math expressions sqrt(2).
There is also ka-lite[2] which is building a "hosted khan-exercises" application, which includes a basic "teacher admin" view. It would be worth taking a look at it -- it is a very well done django app.
More feedback when the demo starts working again :)
_________
[1] https://github.com/Khan/khan-exercises
[2] https://github.com/jamal
Read the rest
Unfortunately, I found that 5 minute fork doesn't initialize git submodules for https://github.com/Khan/khan-exercises. :(
In 5 minute forkDid you apply for a job as an intern or full-timer?
We're mostly looking for longer-term non-volunteer commitments when dealing with things like our data/analytics, but our open source repos are very volunteer-friendly: https://github.com/khan/khan-exercises
In Ask HN: Who is hiring? (March 2013)Very cool.
Thanks for the cool post. I am not sure I got the difference between the LL and LR parser. Is what you have above an LR parser?
Also, why did you choose to represent both + and - as "ADD" tokens (and * and / as "MUL") is this to enforce evaluation priority? It would be interesting to see if you can add or ^ as an exponent for this calculator.
Maybe you intended this post strictly as as an educational post, but I think doing parsing right (and from first principles) is a really cool thing to have. Check out how khan-exercises framework uses to parse math expressions into an AST:
https://github.com/Khan/khan-exercises/blob/master/utils/mat...
In How To Write A Calculator in 70 Python LinesKhan Academy
Mountain View, CA - full-time and intern, designers and devs
We're a non-profit whose mission is to provide a world-class education to anyone, anywhere. We're scaling quickly. Our students answer over 2 million math problems per day (over 950mm total so far), all generated by our open source exercise generation framework (https://github.com/Khan/khan-exercises), and our videos (now from a variety of authors including Sal) have been viewed over 220mm times. We're tracking all that data and using it to customize each student's experience as well as building brand-new tools like our new programming environment (http://ejohn.org/blog/introducing-khan-cs/).
We could use your help. Working for Khan Academy is one of the highest educational impact positions you can imagine, and we've been called by Wired one of the best places to wo
Read the rest
rk in Silicon Valley: http://news.ycombinator.com/item?id=4157078.
We're hiring designers and all types of devs -- mobile, frontend, backend, data scientist, whatever you want to call yourself.
Big plans ahead.
https://www.khanacademy.org/careers/interns
https://www.khanacademy.org/careers
Khan Academy
Mountain View, CA - full-time and intern, designers and devs
We're a non-profit whose mission is to provide a world-class education to anyone, anywhere. We're scaling quickly. Our students answer over 2 million math problems per day (over 900mm total so far), all generated by our open source exercise generation framework (https://github.com/Khan/khan-exercises), and our videos (now from a variety of authors including Sal) have been viewed over 220mm times. We're tracking all that data and using it to customize each student's experience as well as building brand-new tools like our new programming environment (http://ejohn.org/blog/introducing-khan-cs/).
We could use your help. Working for Khan Academy is one of the highest educational impact positions you can imagine, and we've been called by Wired one of the best places to wo
Read the rest
rk in Silicon Valley: http://news.ycombinator.com/item?id=4157078.
We're hiring designers and all types of devs -- mobile, frontend, backend, data scientist, whatever you want to call yourself. Though it's less likely to fit with the HN crowd, we're also looking for an operations assistant, someone to join our team that works with schools, and contractors to create math content for the site.
Big plans ahead.
https://www.khanacademy.org/careers
Khan Academy - Mountain View, CA
Full-time and intern, designers and devs
We're a non-profit whose mission is to provide a world-class education to anyone, anywhere. We're scaling quickly. Our students answer over 2 million math problems per day (over 800mm total so far), all generated by our open source exercise generation framework (https://github.com/Khan/khan-exercises), and our videos (now from a variety of authors including Sal) have been viewed over 200mm times. We're tracking all that data and using it to customize each student's experience as well as building brand-new tools like our new programming environment (http://ejohn.org/blog/introducing-khan-cs/). We could use your help. Working for Khan Academy is one of the highest educational impact positions you can imagine, and we've been called by Wired one of the best places to wo
Read the rest
rk in Silicon Valley: http://news.ycombinator.com/item?id=4157078. We're hiring designers and all types of devs -- mobile, frontend, backend, whatever you want to call yourself. Big plans ahead. http://www.khanacademy.org/careers
Khan Academy - Mountain View, CA - full-time and intern, designers and devs
We're a non-profit whose mission is to provide a world-class education to anyone, anywhere. We're scaling quickly.
Our students answer over 2 million math problems per day (over 800mm total so far), all generated by our open source exercise generation framework (https://github.com/Khan/khan-exercises), and our videos (now from a variety of authors including Sal) have been viewed over 200mm times. We're tracking all that data and using it to customize each student's experience as well as building brand-new tools like our new programming environment (http://ejohn.org/blog/introducing-khan-cs/). We could use your help.
Working for Khan Academy is one of the highest educational impact positions you can imagine, and we've been called by Wired one of the best places to
Read the rest
work in Silicon Valley: http://news.ycombinator.com/item?id=4157078.
We're hiring designers and all types of devs -- mobile, frontend, backend, whatever you want to call yourself. Big plans ahead.
http://www.khanacademy.org/careers
Khan Academy - Mountain View, CA - full-time and intern, designers and devs
We're a non-profit whose mission is to provide a world-class education to anyone, anywhere. We're scaling quickly.
Our students answer over 2 million math problems per day (over 700mm total so far), all generated by our open source exercise generation framework (https://github.com/Khan/khan-exercises), and our videos (now from a variety of authors including Sal) have been viewed over 190mm times. We're tracking all that data and using it to customize each student's experience as well as building brand-new tools like our new programming environment (http://ejohn.org/blog/introducing-khan-cs/). We could use your help.
Working for Khan Academy is one of the highest educational impact positions you can imagine, and we've been called by Wired one of the best places to
Read the rest
work in Silicon Valley: http://news.ycombinator.com/item?id=4157078.
We're hiring designers and all types of devs -- mobile, frontend, backend, whatever you want to call yourself. Big plans ahead.
http://www.khanacademy.org/careers
Khan Academy - Mountain View - (full-time and intern, designers and devs)
Our mission is to provide a world-class education to anyone, anywhere. We're scaling quickly.
Our students answer over 2 million math problems per day (over 600M total so far), all generated by our open source exercise generation framework (http://github.com/khan/khan-exercises), and our videos (now from a variety of authors including Sal) have been viewed over 180MM times. We're tracking all that data and using it to customize each student's experience. We could use your help.
Working for Khan Academy is one of the highest educational impact positions you can imagine and we've been called by Wired one of the best places to work in Silicon Valley: http://news.ycombinator.com/item?id=4157078.
We're hiring designers and all types of devs -- mobile, frontend, backend,
Read the rest
whatever you want to call yourself. Big plans ahead.
http://www.khanacademy.org/careers
So why are these remarks getting downvoted? BTW, could someone provide links with more details, i.e. what was closed, this still appears pretty open: https://github.com/khan/khan-exercises
In John Resig: Redefining the Introduction to Computer Science at Khan AcademyKhan Academy - Mountain View - (full-time and intern, designers and devs)
Our mission is to provide a world-class education to anyone, anywhere. We're scaling quickly.
Our students answer over 2 million math problems per day (over 600M total so far), all generated by our open source exercise generation framework (http://github.com/khan/khan-exercises), and our videos (now from a variety of authors including Sal) have been viewed over 145MM times. We're tracking all that data and using it to customize each student's experience. We could use your help.
Working for Khan Academy is one of the highest educational impact positions you can imagine and we've been called by Wired one of the best places to work in Silicon Valley: http://news.ycombinator.com/item?id=4157078.
We're hiring designers and all types of devs -- mobile, frontend, backend,
Read the rest
whatever you want to call yourself. Big plans ahead.
http://www.khanacademy.org/careers
Khan Academy - Mountain View - (full-time and intern, designers and devs)
Our mission is to provide a world-class education to anyone, anywhere. We're scaling quickly.
Our students answer over 2 million math problems per day (over 500M total so far), all generated by our open source exercise generation framework (http://github.com/khan/khan-exercises), and our videos (now from a variety of authors including Sal) have been viewed over 145MM times. We're tracking all that data and using it to customize each student's experience. We could use your help.
Working for Khan Academy is one of the highest educational impact positions you can imagine.
We're hiring designers and all types of devs -- mobile, frontend, backend, whatever you want to call yourself. Big plans ahead.
http://www.khanacademy.org/jobs
In Ask HN: Who Is Hiring? (May 2012)Showing the 15 most recent of 37 sources. Enable JavaScript to search and browse every indexed mention.