Unknowns, Expressions and… · B4 Mathematics

Lesson notes

Indicator: B4.2.2.2.1 - Solve a given one-step equation using manipulatives

By the end of the lesson, learners can:

Use a pan balance (or its drawings) to represent one-step addition and subtraction equations with a symbol for the unknown.
Determine the value of the unknown in an equation such as 7 + [] = 12 or 19 - [] = 11 by using concrete objects (bottle tops, stones, or cubes).
Explain, in their own words, why both sides of a pan balance must be equal for the equation to be true.
Record the solution to a one-step equation after solving it with manipulatives, using correct symbols such as [] or a letter.
Work in pairs or small groups to verify each other’s solutions and justify their reasoning.

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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: B4.2.2.2.1 - Solve a given one-step equation using manipulatives
Suggested placement: Term 2, Week 10 (Week 22 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 a pan balance: (i) 7 + [] = 12 (ii) 19 - [] = 11