Unknowns, Expressions and… · B4 Mathematics

Lesson notes

Indicator: B4.2.2.1.1 - Write a given problem as an equation in which a symbol is used to represent an unknown number

By the end of the lesson, learners can:

Identify the unknown number in a given word problem or number sentence.
Explain that a box symbol, letter, or other symbol stands for a missing or unknown value.
Write a given problem as an equation using a symbol (such as [], x, or n) for the unknown number.
Justify their choice of equation by explaining what each part of the equation represents in the original problem.
Check whether their equation correctly matches the problem by re-reading the problem and comparing it with the equation.

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Strand: Algebra (Strand 2)
Sub-strand: Unknowns, Expressions and Equations (2.2)
Content standard: B4.2.2.1 - Express a given problem as an equation in which a symbol is used to represent an unknown number
Indicator: B4.2.2.1.1 - Write a given problem as an equation in which a symbol is used to represent an unknown number
Suggested placement: Term 2, Week 9 (Week 21 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: Mathematics Curriculum for Primary Schools (Basic 4-6), 2019, p. 33
Transcribed from the official NaCCA publication. Check this page against the source.

E.g. 1. Ask students to explain the purpose of the box symbol in the following equation: 15 - [] = 8