Learn math visually, free from discovery to mastery
One strong mental image per concept: pizza for fractions, an elevator for negative numbers, a grid for multiplication. Step-by-step lessons, 3-minute drills, games, a multilingual glossary and printable worksheets.
- 79+
- Math concepts
- 198+
- Guided steps
- 11
- Math games
- 26+
- Glossary terms
Everything you need
Lessons
Five-step lessons with a friendly guide, from the concrete to the abstract.
OpenConcepts
One visual metaphor per idea, with interactive illustrations.
OpenGames
Timed challenges that earn XP: fractions, equations, geometry and more.
Open3-minute drill
A quick adaptive workout that revisits the concepts you missed.
OpenGlossary
Every key math word explained simply in your language.
OpenWorksheets
Printable practice with the answer key for home or class.
OpenMath levels (M0 to M7)
From number sense in primary school to derivatives in high school.
Discovery
Number sense, counting and place value.
6-8 yrs
Explorer
Operations and first fractions.
8-10 yrs
Builder
Negative numbers, decimals and percentages.
10-11 yrs
Thinker
Geometry, area, angles and coordinates.
11-13 yrs
Strategist
Proportions, patterns and statistics (middle school).
13-14 yrs
Mastery
Functions, algebra and systems (high school).
15-16 yrs
Advanced
Quadratics, trigonometry, vectors and statistics.
16-17 yrs
Expert
Derivatives, logarithms and proof-style reasoning.
17-18 yrs
Explore concepts
All conceptsCounting & number sense
Count, compare and group objects with confidence.
Place value
Ones, tens and hundreds: where a digit's value comes from.
Addition & subtraction
Move along the number line to add and take away.
Multiplication
Rows and columns: see multiplication as a grid.
Division & sharing
Share fairly: division as giving everyone the same.
Fractions
Equal parts of a whole: the pizza, the chocolate bar.
Negative numbers
Above and below zero: the elevator and the thermometer.
Percentages & decimals
Discounts and prices: a percent is a fraction of 100.
Perimeter & area
Fence the garden: measure the border and the surface.
Math games
Glossary highlights
Full glossaryStart with one concept today
Free forever, multilingual, and built to make math click.