Number Operations (Addition… · B3 Mathematics

Lesson notes

Indicator: B3.1.2.4.4 - Show an understanding of the property of commutativity

By the end of the lesson, learners can:

State the commutative property of addition in their own words: changing the order of addends does not change the sum.
Solve addition problems within 1000 by swapping the positions of the addends and confirming that both sums are equal.
Verify that the commutative property works for addition but not for subtraction, using concrete examples within 1000.
Apply the commutative property to check the accuracy of addition calculations as a self-correction strategy.
Explain and justify why the order of numbers can be changed when adding, using examples and reasoning.

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Strand: Number (Strand 1)
Sub-strand: Number Operations (Addition, Subtraction, Multiplication and Division) (1.2)
Content standard: B3.1.2.4 - Develop and apply personal and standard strategies for adding and subtracting within 1000
Indicator: B3.1.2.4.4 - Show an understanding of the property of commutativity
Suggested placement: Term 2, Week 1 (Week 13 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 1-3), 2019, p. 53
Transcribed from the official NaCCA publication. Check this page against the source.

E.g. 1. Give addition problems and have learners interchange the position of the addends and solve. for example 236 + 453 = and 453 + 236 =