CGH FREE LEARNING · OPEN TO EVERYONE
Numerosity.
Math makes sense,
one step at a time.
Understand the idea. Try a step. Build your confidence.
Free. No account. No ads. Guided tutoring with verified problem types, all processed in your browser.
YOUR PACE. YOUR STARTING POINT.
What would you like to learn?
Choose by skill or course level. You can start anywhere; age does not determine ability.
Curriculum map and current coverage
Initial release: 22 focused lessons across seven pathways. Each lesson has an explanation, a worked example, hints and generated numeric practice. College coverage is introductory; further study begins with even-number proofs.
Coverage will expand to patterns, shapes, time, broader geometry, Algebra II, precalculus, differential equations, advanced probability, number theory, abstract algebra and real analysis. These subjects are not yet comprehensive courses here.
This is structured tutoring, not unrestricted AI chat. The expression checker accepts numeric arithmetic, not general symbolic algebra. Numeric equivalents such as 1/2 and 0.5 are accepted; variables and units belong only in the dedicated tools described below.
The idea
Another way to think about it
Try it yourself
Difficulty adjusts number ranges within this problem type; it does not change the concept.
Enter a number or arithmetic expression, such as 3/4 or (2+1)/4. Do not include units or “x =”.
Step by step
Email only the details you want to share. Do not include personal or school information.
SEE THE MATHEMATICS
Make an idea tangible.
Number line
Function explorer
Explore y = mx + b over −5 ≤ x ≤ 5. The graph has a fixed −10 to 10 vertical range; values beyond it are clipped.
| x | y |
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Equation balance
Solve ax + b = c. Handles one, no, and infinitely many solutions.
Arithmetic checker
Check numeric arithmetic with parentheses, fractions and powers. Use * to multiply and ^ for powers.
Rectangle area
Your learning, on your device.
Optional progress saves lesson attempt counts and correct answers in this browser only. It does not sync between devices and can disappear when browser data is cleared. Answers and problem text are never saved.
Recommendations use practice results only: review a topic after a missed answer; after three correct first attempts, try the next lesson. These are study suggestions, not a mastery assessment.
Keep following your curiosity.
Explore rates, measurement and change through What If, or discover everyday systems with How It Works.