Unknowns, Expressions and… · B4 Mathematics

Lesson notes

Learning Objectives

Indicator: B4.2.2.2.5 - Identify the unknown in a problem, represent the problem with an equation, and solve the problem concretely, pictorially or symbolically

By the end of the lesson, learners can:

Identify the unknown quantity in a given word problem and state what it represents.
Translate a word problem into a one-step equation using a letter or symbol for the unknown.
Solve the equation concretely using linking cubes or counters, pictorially using drawings, and symbolically using inverse operations.
Check the solution by substituting the answer back into the original problem.
Explain the steps they took to solve a problem and justify why their answer makes sense.

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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: B4.2.2.2.5 - Identify the unknown in a problem, represent the problem with an equation, and solve the problem concretely, pictorially or symbolically
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. Provide students with linking cubes to model situations. Pose the problem: Kobby has 13 red marbles and 22 blue marbles. How many more blue marbles than red marbles does Kobby have? Observe how students solve the problem