Chocolate Split
Divide a rectangular chocolate bar into k equal parts — by area, or into congruent shapes that match under rotation and reflection. The puzzle is rooted in the visuospatial planning paradigms of the Wechsler Block Design Test and CANTAB spatial planning, plus the equal-sharing tradition for understanding fractions in early math education. Parameters adjust to the level and the task.
Example
A generated instance. Parameters such as difficulty, size, and symbol set are adjustable.
Task focus
Each task format is associated with these cognitive categories:
spatial cognition
Understanding and manipulation of spatial relations, orientation, mental rotation of objects.
executive functions
Set of processes for planning, organizing, initiating, and controlling behavior. Includes planning, working memory, inhibition, and cognitive flexibility.
visual perception
Processing of visual information: recognition of shapes, colors, spatial relations, objects, and faces.
Evidence-informed format
Divide a rectangular chocolate bar into k equal parts — by area, or into congruent shapes that match under rotation and reflection. The puzzle is rooted in the visuospatial planning paradigms of the Wechsler Block Design Test and CANTAB spatial planning, plus the equal-sharing tradition for understanding fractions in early math education.
Source: Block Design (Wechsler); CANTAB spatial planning; equal-sharing tradition
How to use it
- 1Open the exercise and adjust the difficulty to the student's current level — usually it is better to start slightly easier than feels right.
- 2Read the rules. They are short, usually 10–20 seconds.
- 3Use the generated task as structured educational material, with accuracy and clarity prioritized over speed.
- 4Compare the answer with the reference and leave a human-written comment if the task is assigned through the student cabinet.
Who it's for
- •Educators and tutors — as material for lessons, review, and home practice.
- •Speech, special-education, and development specialists — for children and adults; parameters adjust to the student's level.
- •Parents — to receive clear assignments and leave comments about completion.
Frequently asked
Can I practice without an account?
Yes. The Chocolate Split exercise itself runs in your browser without an account. Sign-up is only needed if you work with clients or want to save progress between sessions.
What is the task focus of Chocolate Split?
Primarily — spatial cognition, executive functions and visual perception. The full list is in the section above, with short definitions for each function.
How long does one task take?
Most generated tasks are designed for short use in lessons, homework, or individual practice sets. The exact time depends on difficulty and student level.
Can I use Chocolate Split with clients?
Yes. In BrainTrainings Academy, Chocolate Split can be added to a worksheet set with difficulty controls, student assignment, completion time, and comments.