IB MYP 2 Mathematics Assessment || Criterion B || Algebra - Expression

IB MYP 2 Mathematics

Criterion B Task – Expression: Communicating Mathematical Ideas

Instructions

• You have 50 minutes to complete this task.
• Show all your working and explain your thinking using correct mathematical language, symbols, and steps.
• Use full sentences when explaining your reasoning, especially for word problems and formulas.

Task: Expression of Mathematical Ideas

1. Part A – Simplifying Expressions:
   Simplify the following expressions and show all steps:
   • \( 3x + 5x - 7 \)
   • \( 2(a + 3) + 4a \)
   • \( 5y - 3(2y - 4) \)
2. Part B – Translating Word Problems:
   Write an algebraic expression for each situation:
   • A rectangle has a length that is 3 meters longer than twice its width \(w\). Write an expression for the perimeter.
   • Sarah has \(n\) marbles. She buys 5 more packs of 4 marbles each. Write an expression for her total number of marbles.
3. Part C – Patterns and Formulas:
   The sequence of numbers is: 2, 5, 8, 11, …
   • Write an expression for the \(n^{th}\) term.
   • Find the 10th term using your expression.
4. Part D – Reasoning and Explanation:
   Show all steps in your calculations and explain your thinking clearly. Use proper mathematical notation.

Criterion B Rubric – Expression

Level	Description
0	The student does not reach a standard described by any of the descriptors below.
1–2	Communicates mathematical ideas with limited clarity. Little use of correct notation or reasoning.
3–4	Communicates mathematical ideas with some clarity. Some correct use of notation and reasoning.
5–6	Mathematical ideas are clearly expressed. Procedures and reasoning are mostly correct and logical.
7–8	Mathematical ideas are communicated effectively and coherently. Procedures are correct and reasoning is logical and detailed, with consistent use of proper notation.