Courses written from scratch: every topic explained from the "why it works" side, with drawings and worked examples. Learn at your own pace, no sign-up and no fees.

Every topic also comes with exercises solved step by step

Maths for primary school

A course for years 4-8. Every lesson explains one idea starting from "why this works", names the common mistake and gives short exercises to try right after the explanation. Once you have worked through a topic, you can test yourself on our exercises.

Maths in secondary school

The core secondary-school syllabus: functions, sequences, trigonometry, plane geometry and probability - step by step, up to the final exam. Once you have worked through a topic, you can test yourself on our exercises.

From Zero to Engineer

A course for technical degrees: from school gaps all the way to calculus. Every topic explained step by step, with worked examples. Once you have worked through a topic, you can test yourself on our exercises.

Interesting Mathematical Problems

Non-obvious problems and interesting mathematical challenges for those who want to think outside the box and go beyond the standard curriculum. Once you have worked through a topic, you can test yourself on our exercises.

What you will find in the knowledge base

Lessons that explain

Every topic from the "why it works" side, not just a procedure to memorise. With drawings and worked examples.

Follows the curriculum

The primary and secondary courses follow the topics of the national curriculum, so it is easy to find whatever is being covered in class.

Exercises for every topic

After reading a lesson you can test yourself on exercises from the same topic - each with a step-by-step solution.

Practise on your own whiteboard

Open a blank PhiBoard and work the problem your own way, with formulas, graphs and figures at hand.

Frequently asked questions

Are the maths courses free?

Yes. Every lesson and exercise is free, with no account and no limits. There is no paid tier.

Which school years are these materials for?

For primary school years 4-8, for secondary school, and for technical degrees. Each level has its own course, and primary school has a separate course for every year.

Do the materials follow the curriculum?

The primary and secondary courses follow the topics of the national curriculum. The university course has its own structure, as it covers material beyond school.

What is the difference between courses and exercises?

A course explains a topic, the exercises let you practise it. Every curriculum topic has its own set of exercises with step-by-step solutions - examples are drawn at random, so each set is different.

Can I use these materials in class?

Yes, you may use them when working with students. Please keep the attribution.

PhiBoard in practice

See how PhiBoard works in specific situations:

Online math whiteboard Whiteboard for teachers Online tutoring whiteboard Function graphs online