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.
What belongs in each mystery box?
Every mystery box holds the same value. Make the two sides balance.
0 of 7 challenge types explored at this stage
Keep the discovery going.
Turn a little understanding into a fresh page of practice.
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.
Practise by subject and stage.
In a group of 48 students, n(A) = 23, n(B) = 19, and n(A ∩ B) = 8. How many students are in neither A nor B?
Use inclusion-exclusion within a universal set to find how many items belong to neither subset.
0 of 4 solved in this round
Featured, challenges & worksheets in Reasoning
Conditional probability tables
Calculate conditional probability from subgroup counts and express the result as a simplified fraction.
Boolean logic evaluation
Evaluate compound Boolean expressions using NOT, AND and OR operators.
Ordered permutations P(n, 2)
Calculate ordered two-element permutations P(n, 2) = n(n − 1) from a set of distinct candidates.