Number Operations (Addition… · B1 Mathematics

Lesson notes

Learning Objectives

Indicator: B1.1.2.4.2 - Solve one-step word problems involving addition and subtraction within 20 using a variety of strategies

By the end of the lesson, learners can:

Read a one-step word problem involving addition or subtraction within 20 and identify what is being asked.
Solve addition word problems within 20 using at least two different strategies (objects, drawings, counting on, or doubles).
Solve subtraction word problems within 20 using at least two different strategies (objects, drawings, counting down, or taking apart).
Explain to a partner how they solved a word problem and justify why their answer makes sense.
Solve word problems with unknowns in all positions (e.g., 10 + ? = 13, 15 - ? = 8) using objects or drawings.

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Curriculum details

Strand: Number (Strand 1)
Sub-strand: Number Operations (Addition, Subtraction, Multiplication and Division) (1.2)
Content standard: B1.1.2.4 - Apply strategies for adding and subtracting to 20
Indicator: B1.1.2.4.2 - Solve one-step word problems involving addition and subtraction within 20 using a variety of strategies
Suggested placement: Term 2, Week 6 (Week 18 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. 10
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

E.g. 1. Use a variety of strategies (objects, drawings, mental strategies, counting on, doubles etc.) to solve addition word problems to 20 involving adding to, putting together - and with unknowns in all positions.
- Ama has 10 mangoes and receives 3 more mangoes. How many mangoes does she have altogether?
E.g. 2. Use a variety of strategies (objects, drawings, mental strategies, counting down, etc.) to solve subtraction word problems to 20 involving taking from, taking apart and comparing - and with unknowns in all positions.
- Kojo has 15 pencils. He gave 7 to Ato. How many pencils are left?
- Kafui had 5 pencils. Kwame had 3 pencils. How many more pencils did Kafui have than Kwame?