IB MYP Maths: The Four Criteria Guide for Parents

Parents new to IB MYP maths ask one question more than any other: why is my child, who is good at mathematics, getting mediocre reports? The answer is almost always the same, and it is not about ability.

Marked on four things, not one

IB MYP maths is assessed against four criteria: A, knowing and understanding; B, investigating patterns; C, communicating; D, applying mathematics in real-life contexts. Each is scored from 1 to 8, and all four carry equal weight.

A student who computes accurately and quickly is doing well at criterion A. That is one criterion out of four, and it is the only one that rewards the thing most parents and students think of as being good at mathematics.

What the other three actually ask

Criterion B asks a student to investigate a pattern — try cases, notice a rule, express it generally, and then justify why it holds. A student who finds the pattern and writes the answer has done perhaps half of what is being marked. The justification is where the top bands live, and students raised on answer-getting almost never provide it unprompted.

Criterion C marks communication in its own right: appropriate mathematical language, more than one form of representation, and lines of reasoning a reader can follow.

Criterion D asks for mathematics applied to an unfamiliar real context, and it requires evaluating whether the result and the assumptions behind it were actually valid. Students compute a correct answer, never ask whether the model was reasonable, and lose the band.

It is also worth knowing that criterion A explicitly tests unfamiliar situations as well as familiar ones, so a student who has drilled question types rather than understood them stalls even there.

None of this is fixed by more exercises

This is the practical consequence and the reason more practice often fails to move the grade.

These are separate skills from calculation, they are teachable, and most students have simply never been shown what a good criterion B response looks like. They are not failing at mathematics; they are producing a page of correct arithmetic for a task that wanted an argument.

What an investigation actually contains

Since the point is that students have not seen one, here is what distinguishes a strong response.

A typical task gives a pattern and asks the student to explore it. A weak response works several cases correctly and states the rule. A strong response does four things: it works cases systematically rather than at random, it describes the pattern in words before trying to write it symbolically, it expresses a general rule, and it says why the rule must hold rather than only that it fits the cases tried.

The last step is almost always what is missing. Students find it strange at first, because in most of their schooling finding the answer ended the task. Here it is roughly halfway.

Standard and extended in MYP 4 and 5

In the later years IB MYP maths runs at two levels of challenge. Standard gives all students sound basic principles. Extended supplements that with additional topics and skills and greater breadth and depth, and is the intended foundation for DP Mathematics at Higher Level.

Choosing standard does not formally bar a student from DP HL, but extended is the normal route and the practical gap is real. Schools implement the split differently, so confirm with your school which route your child is on — it is not always obvious from a report.

eAssessment, where your school offers it

IB offers an optional on-screen external assessment at the end of MYP 5. Schools choose whether to register, only MYP year 5 students may sit it, and there are separate papers for mathematics and for extended mathematics.

Where a school does offer it, it is worth preparing for specifically: working through mathematics on screen, with on-screen tools, is a different experience from writing on paper, and students who have only ever done the latter lose time to the interface rather than to the mathematics.

No board examination, which is the opportunity

Assessment in IB MYP maths is internal, marked by teachers against the criteria, with IB moderation. There is no compulsory external examination anywhere in the programme.

For families arriving from CBSE or IGCSE this is the single biggest adjustment: there is normally no Class 10 board examination equivalent at all. It is also the opportunity, because these are the years to fix reasoning and communication, which become much harder to repair once DP examinations are close.

How parents can help without knowing the mathematics

The most useful contributions require no mathematical knowledge at all, which surprises families who feel unable to help.

Ask the child to explain how they approached a problem, not whether they got it right. Criterion B and C are both about making reasoning visible, and a child who can explain their thinking out loud to a non-expert is practising exactly the skill being marked.

The second is to read the criteria themselves. They are published, they are written in plain language, and a parent who has read them can tell whether a piece of work is missing a justification or a conclusion — which is usually what the grade is actually about.

Transferring in from another system

Students arriving from CBSE, IGCSE or a national curriculum usually have sound technique and are thrown by the assessment style. They have been marked for years on correct answers, and MYP marks investigation, communication and application as separate, equally weighted criteria.

The first few weeks with these students are mostly about showing them what is being asked for. It is rarely a mathematics problem, and it resolves quickly once named.

MYP normally maps to Class 6 to 10, but the IB permits abbreviated formats, so confirm your child's MYP year with the school rather than inferring it from their class. Students approaching the Diploma should read our IBDP mathematics guide next.