Study skills · Principles
Interleaving: Learn to Choose the Right Approach
A worksheet headed ‘area’ tells you which kind of calculation to use. A mixed set asks you to decide. Interleaving creates opportunities to distinguish related tasks once you have enough knowledge to attempt them.
What supports this approach
The learning-techniques review describes promising but task-dependent evidence for interleaving. It should not be interpreted as a reason to switch constantly between unrelated activities.
Evidence and background: Dunlosky et al. (2013): Improving Students’ Learning.
Methods to put it into practice
Mixed problem sets
Combine two or three related question types without section labels revealing the solution method. State the required quantity before calculating.
Compare near neighbours
Place similar-looking questions together and explain what changes the choice of method. Focus on the relevant cue in the question.
Revisit an earlier type
Include a previously learned question among current ones. If you cannot begin it, return to a worked example rather than repeatedly guessing.
A repeatable study pattern
Practise each unfamiliar type with support first.
Mix a small number of related types.
Name the method and justify your choice before solving.
Review selection errors separately from arithmetic errors.
Example: area or perimeter?
A rectangle is 6 cm long and 4 cm wide. Question A asks for the ribbon needed around its edge: perimeter = 2 × (6 + 4) = 20 cm. Question B asks for the paper needed to cover it: area = 6 × 4 = 24 cm².
Before calculating, underline ‘around’ or ‘cover’ and identify the quantity. Then try a 5 cm by 3 cm rectangle with the question order reversed: covering needs 15 cm²; edging needs 16 cm.
Finally remove the cue words: a gardener wants a fence around a rectangular plot. Explain why this asks for perimeter. Record a wrong formula choice separately from a multiplication slip.
Try it in another subject
In a language lesson, mix sentences requiring two verb forms and explain the context that selects each form. Learn the forms first, then practise choosing between them.
Common mistakes and adjustments
Mixing everything at once can obscure the skill being learned. Start with a small family of related tasks.
Keep the session focused. Interleaving problems does not require checking messages or changing apps between questions.
An example week
This is an example week, not a prescribed review interval. Adjust the tasks, time and support to the learner’s course and recall results.
| Day | Task | Minutes |
|---|---|---|
| Monday | Learn area and perimeter with examples | 20 |
| Wednesday | Solve a mixed area/perimeter set | 15 |
| Friday | Retry method-choice errors with new shapes | 15 |
Put the week in your calendar
Replace the bracketed date and time zone, then paste the prompt into Magic Generate in School Calendar. Review dates, durations and tasks before adding the events. See the Magic Generate guide.
Systems that use this principle
Some systems use this principle as a core step; others offer it as an optional extension.
A Worked-Example Practice Cycle for Maths and Science
Follow a complete algebra practice cycle from a solved example to missing steps, independent work and later mixed questions, with answer checks included.
Offers this principle as an optional extensionAn Error-Log Review System: Correct, Retry, Revisit
Build an error log that leads to action: diagnose mistakes, explain corrections, retry new questions and revisit them later using a worked maths example.
Offers this principle as an optional extensionBuild a Weekly Study System with Recall, Spacing and Review
Combine recall, feedback and spaced sessions across three subjects. Use an adaptable weekly study calendar and a practical end-of-week review.
Offers this principle as an optional extensionFor a subject-specific plan, see Math study routines. Or return to all study principles and systems.
Sources and review
Reviewed 2026-09-27. Examples and calendar schedules are editorial illustrations.