Unknowns, Expressions and… · B4 Mathematics

Lesson notes

Indicator: B4.2.2.2.3 - Solve a given equation when the unknown is on the left or right side of the equation.

By the end of the lesson, learners can:

Solve one-step equations where the unknown (symbol) is on the left side, such as n + 15 = 40 or y - 8 = 25.
Solve one-step equations where the unknown (symbol) is on the right side, such as 30 = m + 12 or 50 = 20 + k.
Use base ten materials to model and solve equations with the unknown on either side.
Explain orally why an equation remains true when the same operation is performed on both sides, whether the unknown is on the left or the right.
Check their solutions by substituting the value back into the original equation.

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Strand: Algebra (Strand 2)
Sub-strand: Unknowns, Expressions and Equations (2.2)
Content standard: B4.2.2.2 - Solve one-step equations involving a symbol to represent an unknown number
Indicator: B4.2.2.2.3 - Solve a given equation when the unknown is on the left or right side of the equation.
Suggested placement: Term 2, Week 11 (Week 23 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. 34
Transcribed from the official NaCCA publication. Check this page against the source.

E.g. 1. Ask students to solve the following using base ten materials: (i) 109 + [] = 164 (ii) [] - 50 = 150