Unknowns, Expressions and… · B4 Mathematics

Lesson notes

Learning Objectives

Indicator: B4.2.2.2.4 - Solve a given one-step equation using “guess and check”

By the end of the lesson, learners can:

Explain what a symbol (such as a box, letter, or shape) represents in a one-step equation.
Use the “guess and check” strategy to solve one-step addition and subtraction equations.
Verify a solution by substituting the guessed value back into the original equation to confirm both sides are equal.
Record guess and check trials in an organised table, showing the guess, the check, and whether it is correct.
Solve at least three one-step equations independently using guess and check and justify their final answers.

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Curriculum details

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: B4.2.2.2.4 - Solve a given one-step equation using "guess and check"
Suggested placement: Term 2, Week 12 (Week 24 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.

Exemplars (from the NaCCA curriculum)

E.g. 1. Ask students to explain what the represents in the number sentences shown. Ask them to place numbers in the symbols to make the number sentence true. [] - 7 = 6 9 + [] = 17