The MYP Extended Mathematics criteria are A: Knowing and understanding, B: Investigating patterns, C: Communicating, and D: Applying mathematics in real-life contexts. Each classroom criterion has a maximum achievement level of 8, producing a combined total out of 32.
Extended Mathematics does not use separate criteria from Standard Mathematics. Instead, students apply the same skills to content involving greater depth, breadth, abstraction, and complexity. This guide explains each criterion, classroom grading, the external eAssessment, and practical ways to improve.
The four MYP Extended Mathematics criteria
The official IB mathematics subject brief confirms that all four criteria are equally weighted. Assessment is criterion-related, meaning work is judged against published standards rather than ranked against classmates.
| Criterion | Maximum level | Main focus |
|---|---|---|
| A: Knowing and understanding | 8 | Selecting and applying mathematics accurately |
| B: Investigating patterns | 8 | Generalizing and justifying mathematical patterns |
| C: Communicating | 8 | Presenting mathematical reasoning clearly |
| D: Applying mathematics | 8 | Modelling and evaluating real situations |
Criterion A: Knowing and understanding
Criterion A measures mathematical knowledge, method selection, and accuracy. Students must recognize the mathematics required, choose an appropriate strategy, and apply it successfully in familiar and unfamiliar situations.
Extended tasks might involve logarithmic equations, rational expressions, trigonometric relationships, or advanced probability. A correct answer matters, but visible working may be necessary to establish that the method is valid. Common weaknesses include choosing an unsuitable formula, relying on unsupported calculator output, and failing to recognize a familiar concept inside an unfamiliar problem.
Criterion B: Investigating patterns
Criterion B assesses mathematical investigation. Students explore examples, identify patterns, formulate general rules, and then verify and justify their conclusions.
For example, listing several terms of a sequence is not sufficient for the highest levels. A student should express the pattern as a general rule, test it with an additional case, and explain why the rule works. Checking examples supports a conjecture, but does not necessarily constitute proof. Strong responses follow the complete chain: explore, identify, generalize, verify, and justify.
Criterion C: Communicating
Criterion C concerns how clearly and logically mathematics is presented. It includes correct notation and terminology, suitable representations, movement between representations, complete reasoning, and coherent organization.
Students should define variables, label graph axes, include units, and distinguish symbols such as equals and approximately equals. Equations, tables, diagrams, graphs, and written explanations should clarify the argument rather than merely decorate it. In the on-screen examination, Criterion C is assessed across all three tasks, so unclear working can limit achievement even when calculations are mostly correct.
Criterion D: Applying mathematics in real-life contexts
Criterion D assesses mathematical modelling. Students identify relevant information, choose and apply a suitable strategy, justify the accuracy of the solution, and explain whether the result makes sense in context.
If a calculation suggests that a structure requires 12.47 panels, the final response should explain that 13 whole panels are needed. It should also include units and consider assumptions such as cutting waste or overlap. Students often lose credit by completing the calculation without interpreting the result, choosing appropriate precision, or discussing limitations.
How classroom assessment is graded
Teachers award criterion levels using a best-fit judgment. Descriptors are grouped into bands of 1-2, 3-4, 5-6, and 7-8; level 0 applies when the work does not reach the first descriptor.
Best fit is not an average of test percentages. Teachers compare the available evidence with the relevant criterion strands and select the descriptor that most accurately represents demonstrated achievement. Schools must assess every strand of all four criteria during the year, although an individual task does not need to assess every criterion.
Final criterion levels are added and commonly converted as follows:
| Criterion total | Final MYP grade |
|---|---|
| 1-5 | 1 |
| 6-9 | 2 |
| 10-14 | 3 |
| 15-18 | 4 |
| 19-23 | 5 |
| 24-27 | 6 |
| 28-32 | 7 |
For example, levels of A: 7, B: 6, C: 5, and D: 7 produce 25 out of 32, corresponding to a classroom grade of 6. The individual results also reveal that communication is the clearest area for improvement. Schools should follow the current mathematics guide and their authorized assessment policy when reporting grades.
RevisionDojo provides further explanations of MYP mathematics assessment and MYP grade boundaries.
How the MYP Extended Mathematics eAssessment works
Students seeking an official MYP course result in Extended Mathematics complete an externally marked on-screen examination. The IB describes mathematics examinations as lasting up to two hours.
| Task | Main criteria assessed | Approximate marks |
|---|---|---|
| Knowing and understanding | A and C | 31-35 |
| Investigating patterns | B and C | 31-35 |
| Applying mathematics in context | D and C | 31-35 |
Across the complete 100-mark examination, each criterion has approximately equal weight. Criterion C is distributed across all three tasks and contributes 25 marks in total. The examination uses the same framework as Standard Mathematics but assesses the additional content and greater challenge of the extended course, as outlined in the IB overview of MYP mathematics.
MYP Extended Mathematics grade boundaries
Classroom grading and external eAssessment grading must not be confused. Classroom criterion levels produce a total out of 32, whereas examination question marks produce a raw mark to which the IB applies session-specific boundaries.
There is no permanent rule such as “70% always equals a 7.” External boundaries may change between sessions through the IB grade-awarding process, so students should not apply the classroom conversion table to an examination percentage. The IB's grading and awards guidance confirms that official course results are reported on a 1-7 scale.
The full MYP Certificate also has requirements beyond one mathematics result. Current MYP passing criteria include at least 28 points out of 56, at least grade 3 in each required eAssessment component, and completion of the remaining certificate conditions.
Common mistakes and how to avoid them
Students often understand the mathematics but provide the wrong kind of evidence for the criterion. For example, a polished graph does not compensate for an unjustified general rule in Criterion B, and a correct model does not fully satisfy Criterion D unless its result is interpreted. Before submitting, identify the assessed criterion and check every relevant strand rather than assuming accuracy alone determines the level.
Another mistake is confusing complexity with quality. Using an advanced technique is not automatically better than choosing a simpler method that is valid, efficient, and clearly explained. Likewise, lengthy prose can weaken Criterion C if it obscures the mathematical sequence. Aim for concise reasoning in which every line has a clear purpose.
Use this short final check:
- Method: Is the selected mathematics appropriate, and is every calculation accurate?
- Evidence: Have patterns been generalized, tested, and justified where required?
- Communication: Are variables, notation, graphs, units, and rounding conventions clear?
- Context: Is the final result realistic, interpreted, and evaluated against assumptions?
- Command term: Does the response explain, show, verify, or justify as requested?
After receiving feedback, do not record only the total level. Identify the particular criterion strand that limited the response, then practise producing that missing evidence in a new problem.
How to improve in each criterion
Revision should reproduce the evidence demanded by each criterion:
- Criterion A: complete mixed questions without being told which method to use, then check selection and accuracy.
- Criterion B: investigate relationships, formulate general rules, test unseen cases, and justify why each rule works.
- Criterion C: use defined variables, correct symbols, labelled representations, units, and logically ordered working.
- Criterion D: finish contextual solutions with interpretation, suitable precision, assumptions, and limitations.
Pay close attention to command terms. State usually requires a concise answer, while justify demands mathematical evidence and reasoning. The MYP Extended Mathematics Questionbank supports criterion-focused practice, while the Extended Mathematics resource collection provides notes, lessons, and flashcards. Students can also use RevisionDojo's eAssessment preparation advice to practise timing and on-screen working.
Conclusion
The MYP Extended Mathematics criteria measure accurate application, investigation, communication, and real-life modelling. Classroom levels produce a total out of 32, while external examination marks use session-specific boundaries. RevisionDojo's Study Notes and Questionbank can help students practise the distinct evidence required by each criterion rather than revising mathematical content alone.
Sources and referenced URLs
- IB MYP mathematics subject brief
- IB overview of MYP mathematics
- IB MYP grading and awards
- IB MYP passing criteria
- RevisionDojo Extended Mathematics resources
- RevisionDojo Extended Mathematics Questionbank
- RevisionDojo guide to MYP mathematics assessment
- RevisionDojo guide to MYP grade boundaries
- RevisionDojo eAssessment preparation advice
