MathLibs.org™ – Free for Over 2 Decades!
Back in 2003, we coded the 1st version of Mathlibs™. This was so well received by the public that we were overjoyed. Then, about 2 decades later, browsers ceased support for Adobe’s Flash® player, and MathLibs™ disappeared overnight. We are OVERJOYED to tell you that you can now access this remarkable content again by adding a browser extension called RUFFLE.
Please click here to add RUFFLE to you browser, and then enjoyed all of the wonderful content that has been serving children for over 2 decades — the interactive fourth grade math library, MathLibs™ question sets, rapid fire games! It’s all back!
Make your own silly math questions! Have fun while reviewing 4th Grade Math for the state tests. (The click RUFFLE extension is required.) You can also view MathLibs™ FULL SCREEN (ad free) in a new window and try other fun math content below!
It’s easy to explore:
- Click MathLibs™ FULL SCREEN to choose between Multiplication MathLibs™ (Grade 3) and Grade 4 MathLibs™ sets. You can then generate your own silly math questions!
- Click MathLibs™ FULL SCREEN and then choose Lessons to click through fun animated Grade 4 math lessons in: Numbers, Patterns, Measurement, Geometry, Graphing, and Probability. If you prefer to hear audio with the lessons, click here. ← note this will be restored now that we know the power of RUFFLE, please check back!
More fun math on KidCourses.com:
Note: these links are being be restored now that we know the power of RUFFLE. Please visit to links that say “← working” after them. The other links will be restored in time. Please check back!
Colorful PDF of the Grade 4 Lesson 1 concepts (whole numbers, fractions, decimals, rounding, expanded notation, multiples, factors, what it means to be prime, the Associative and Commutative Properties, how we compare numbers and long division)
Rapid Fire Quiz, Lesson 1 (whole numbers, fractions, decimals, rounding, expanded notation, multiples, factors, what it means to be prime, the Associative and Commutative Properties, how we compare numbers and long division) ← working
Rapid Fire Quiz, Lesson 2 (using symbols instead of numbers, patterns, ratios, and percents) ← working
Rapid Fire Quiz, Lesson 3 (length, perimeter, area, volume, time, temperature, and estimation strategies) ← working
Rapid Fire Quiz, Lesson 4 (degrees, types of angles, parallel and perpendicular lines, shapes and solids, congruent figures, symmetry, and transformations) ← working
Rapid Fire Quiz, Lesson 5 (the coordinate grid, x-axis, y-axis, how to plot and find points, and how to use a grid to measure distances) ← working
Rapid Fire Quiz, Lesson 6 (charts, graphs, random sampling, probability, combinations, minimums, maximums, range, mean, median, and mode) ← working
5 Questions (with answer explanations) on Lesson 1, Numeration & Computation
5 Questions (with answer explanations) on Lesson 2, Patterns, Relationships, and Algebraic Thinking
5 Questions (with answer explanations) on Lesson 3, Measurement
5 Questions (with answer explanations) on Lesson 4, Geometry
5 Questions (with answer explanations) on Lesson 5, Coordinate Geometry
5 Questions (with answer explanations) on Lesson 6, Probability and Statistics
Try our Grade 4 Math Review with audio
In addition to playing our free Math Libs™, check out more fun math from kidCourses:
Click here for more fun math posts!
Non-Flash® Math Libs™
If you would like to see the (albeit inferior) non-Flash® content, we do have a few quickie question sets.
👇 👇 Click to See Newest Posts👇 👇
Mathlibs.org™ has been helping students have fun and get over their fears of math for almost a quarter of a century now! We’re working on adding more non-Flash Mathlibs™, and you can see the first, colorful and interactive 👉question set here👈.
We’ve also created some simple 5 question Choose Your Own Multiplication Tables Adventures. To try one, click here: https://kidcourses.com/official-math-libs/

Also…….
If you have a PC, you can purchase the .exe version of Mathlibs™ for $9.99 here. You can also purchase simple PDFs of Mathlibs™ from our store. It breaks my heart that Flash is gone. I hope to be able to load more free math games onto this site in the future. Please visit the shop for downloadable educational course materials in the field of mathematics for students from elementary through junior high, and downloadable printable material in the field of mathematics for grades 0-8.
~ Jessika Jake