Small practice. Bright discoveries.Explore the free starter collection

Learn a little by doing a little

Make an idea click.

Move beyond an answer. Explore visual reasoning puzzles and interactive challenges across all 6 subjects, with instant rule-based verification and step-by-step explanations.

Original visual challenges
0in a rowthis session
Learning stage
Your next discovery

What belongs in each mystery box?

Every mystery box holds the same value. Make the two sides balance.

3 × ? + 428Equal values make a level balance.

0 of 7 challenge types explored at this stage

Keep the discovery going.

Turn a little understanding into a fresh page of practice.

Browse printable worksheets

Streaks count different challenges solved consecutively in this session and reset after an incorrect check. Repeating a solved question adds no points. Original rule-based practice. Age bands are guidance, not an assessment or curriculum certification.

Subject challenges
0in a row

Practise by subject and stage.

Learning stage
ScienceAges 10-12Physics (O Level): Motion, forces & energy
Question 1 of 4
Mass, volume & density

A sample has a mass of 55 g and a volume of 11 cm³. Calculate its density.

Calculate the density of a material sample from its mass in grams and volume in cubic centimetres.

m = 55 g · V = 11 cm³
Print worksheet

0 of 4 solved in this round

Science category

Featured, challenges & worksheets in Science

Physics (O Level): Electricity & magnetismFeatured

Conductors, insulators & circuits

Compare conductors and insulators, series and parallel circuits, switches, fuses and circuit symbols.

Worksheet
Physics (O Level): Motion, forces & energyFeatured

Principle of moments & equilibrium

Apply the principle of moments (F₁d₁ = F₂d₂) to balance a uniform beam about a central pivot.

Worksheet