IB MYP Year 9 Maths Surds – Criterion C Communicating Worksheet | MYP 3
IB MYP Year 9 Maths Surds – Criterion C Communicating
Knowing the Answer Is Only Part of Mathematics. Can You Communicate It Clearly?
This IB MYP Year 9 Mathematics Criterion C Communicating Worksheet is designed to help MYP 3 students develop the mathematical communication skills needed to present solutions clearly, accurately and logically.
Based on Number & Algebra: Indices, Roots & Surds, this Higher Level practice resource focuses not only on finding the correct answer, but also on how students communicate mathematical thinking using precise vocabulary, notation, representations and structured reasoning.
Instant Digital Download
A ready-to-use digital worksheet for IB MYP Year 9 / MYP 3 Mathematics. This is a digital educational resource; no physical product will be shipped.
Criterion C Focus
Practise communicating mathematical ideas clearly and logically.
Higher Level
Designed for MYP 3 / Year 9 Higher Level Mathematics practice.
44 Marks
A complete Criterion C practice resource with 44 marks.
70 Minutes
Structured as a focused Criterion C practice session.
Why This Resource?
In IB MYP Mathematics, getting the answer right is only part of the task. Students also need to demonstrate that they can communicate their mathematical thinking using appropriate language, notation, representations and logical reasoning.
What Students Practise
Students analyse mathematical errors, move between different representations, explain rules, complete “show that” solutions, compare methods and organise written mathematical explanations.
What This Criterion C Worksheet Covers
Mathematical Vocabulary & Notation
Use precise mathematical terminology and appropriate notation when working with surds.
Error Analysis
Identify mathematical errors, explain why they occurred and rebuild solutions correctly.
Mathematical Representations
Move between surd, index, decimal, geometric and number-line representations.
Show That Solutions
Develop complete, coherent and logically structured solutions for “show that” questions.
Comparing Methods
Compare different mathematical approaches and evaluate their effectiveness.
Written Communication
Organise mathematical explanations using clear sentences, appropriate terminology and logical structure.
Criterion C Skills Students Develop
Use Appropriate Mathematical Language
Use terms such as surd, radicand, coefficient, conjugate, exact form and rationalise accurately.
Use Appropriate Representations
Represent mathematical ideas using appropriate forms and move effectively between representations.
Explain Mathematical Thinking
Communicate reasoning rather than simply providing a numerical answer.
Structure Solutions Logically
Present complete, coherent and concise reasoning in a logical order.
Use Precise Notation
Avoid ambiguous notation and distinguish clearly between exact and approximate values.
Evaluate Mathematical Work
Identify weaknesses in mathematical communication and improve the presentation of solutions.
What Students Will Practise
| Task | Focus | Marks |
|---|---|---|
| C1 | Error Analysis | 4 |
| C2 | Error Analysis & Rebuilding a Solution | 5 |
| C3 | Mathematical Representations | 8 |
| C4 | Explaining a Mathematical Rule | 4 |
| C5 | Show That | 5 |
| C6 | Comparing Methods | 5 |
| C7 | Explaining Mathematics to Others | 4 |
| C8 | Notation Clinic | 4 |
| C9 | Organising a Written Explanation | 5 |
| Total | 44 | |
Key Mathematical Vocabulary
Surd
An exact irrational expression involving a root.
Radicand
The number or expression contained inside a radical sign.
Coefficient
The numerical factor multiplying a mathematical term.
Like Surds
Surd terms with the same irrational part that can be combined.
Rational / Irrational
Distinguish between exact rational and irrational values.
Conjugate
An expression used when rationalising certain surd denominators.
Exact Form
A value expressed without rounding or approximation.
Rationalise
Rewrite an expression so that the denominator is rational.
IB MYP Criterion C Level Guidance
| Level | General Communication Focus |
|---|---|
| 0 | Does not reach a standard described by the other levels. |
| 1–2 | Limited use of appropriate mathematical language, forms and organisation. |
| 3–4 | Some appropriate mathematical language, representations and reasoning are demonstrated. |
| 5–6 | Generally appropriate communication, representations and logical reasoning are demonstrated. |
| 7–8 | Consistently appropriate mathematical language and forms are used, with effective movement between representations and complete, coherent, concise reasoning. |
Learn to Communicate Mathematics at a Higher Level
One Step Per Line
Students practise presenting working clearly instead of compressing several mathematical steps into one line.
Use Correct Mathematical Terms
Mathematical vocabulary is treated as part of the solution rather than an optional addition.
Show the Method
Students are encouraged to explain how and why they reached a result.
Write Clear Conclusions
Solutions should finish with a clear mathematical conclusion rather than stopping at an unexplained calculation.
Common Communication Mistakes Addressed
Ambiguous Notation
Practise writing expressions clearly so that their mathematical meaning is unambiguous.
Running Equals Signs
Avoid using equals signs incorrectly when a sequence of mathematical steps is not equivalent.
Exact vs Decimal
Keep exact forms and approximate decimal values clearly distinguished.
Vague Explanations
Replace vague statements with precise mathematical reasoning.
Ideal For
IB MYP Students
Year 9 / MYP 3 students studying Number & Algebra, Indices, Roots & Surds.
Higher Level Mathematics
Students preparing for Higher Level MYP Mathematics practice involving surds and mathematical communication.
Teachers
Useful as classroom practice, independent work, homework, revision or Criterion C preparation.
Parents & Tutors
A structured resource for additional practice in mathematical reasoning and written communication.
What Is Included?
Criterion C Worksheet
Complete 44-mark practice worksheet focused on Communicating.
Surds Practice
Questions covering notation, representations, reasoning and exact forms.
Error Analysis
Tasks requiring students to identify and correct mathematical errors.
Show-That Practice
Structured mathematical communication and reasoning practice.
Comparison Tasks
Compare mathematical methods and communicate which approach is effective.
Self-Assessment
Review progress across error analysis, representations, explanations, reasoning, notation and structure.
Self-Assessment Areas
| Skill Area | Maximum Marks |
|---|---|
| Error Analysis | 9 |
| Representations | 8 |
| Written Explanations | 8 |
| Lines of Reasoning | 10 |
| Notation & Structure | 9 |
| Total | 44 |
Frequently Asked Questions
Build Stronger IB MYP Maths Communication Skills
Use this Criterion C resource alongside your other IB MYP Mathematics worksheets to give students structured practice with mathematical vocabulary, notation, representations and written reasoning.
The goal is not simply to reach the correct answer, but to communicate the mathematics clearly, accurately and logically.
Important
This is a digital educational resource created for learning and practice purposes. It is intended to support students and educators working with the IB MYP Mathematics framework and is not an official IB publication.