Number Operations (Addition… · B1 Mathematics

Lesson notes

Learning Objectives

Indicator: B1.1.2.2.3 - Generate and solve word problem situations when given a number sentence involving addition and subtraction of numbers within 20

By the end of the lesson, learners can:

Read a given addition or subtraction number sentence within 20 aloud.
Generate at least one word problem situation for a given addition number sentence within 20.
Generate at least one word problem situation for a given subtraction number sentence within 20.
Solve word problems they have created, showing the matching number sentence.
Justify why their word problem matches the given number sentence.

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Curriculum details

Strand: Number (Strand 1)
Sub-strand: Number Operations (Addition, Subtraction, Multiplication and Division) (1.2)
Content standard: B1.1.2.2 - Demonstrate an understanding of the concept of equality
Indicator: B1.1.2.2.3 - Generate and solve word problem situations when given a number sentence involving addition and subtraction of numbers within 20
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. 7
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

E.g. Write addition and subtraction problems, learners in their groups discuss and generate word problems to match the number sentences