Unknowns, Expressions and… · B4 Mathematics

Lesson notes

Indicator: B4.2.2.2.2 - Describe orally, the meaning of a given one-step equation with one unknown.

By the end of the lesson, learners can:

State, in their own words, what an equation is and what the symbol (box or letter) represents in a one-step equation
Explain orally the meaning of a given one-step equation such as [] - 13 = 20, identifying which number is unknown and which operation connects the parts
Describe the relationship between the three numbers in a one-step equation (the unknown, the known part, and the result)
Use the words “unknown”, “equation”, “equal”, “left side”, and “right side” correctly when explaining an equation aloud
Read a one-step equation aloud as a complete sentence, such as “A number minus 13 equals 20”

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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: B4.2.2.2.2 - Describe orally, the meaning of a given one-step equation with one unknown.
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 equations and explain their thinking. (i) [] - 13 = 20 (ii) 25 + [] = 100