B1 Mathematics · Term 1 Week 1: Number: Counting, Representation, Cardinality & Ordinality

Lesson notes

Learning Objectives

Indicator: B1.1.1.1.1 - Use number names, counting sequences and how to count to find out “how many?”

By the end of the lesson, learners can:

Count forwards by 1s, 2s, and 10s between any two given numbers from 0 to 100.
Count backwards by 1s from a given number between 0 and 100.
Count up to 100 objects arranged in a line, grid, or circle and answer “how many?” correctly.
Show that the number of objects in a group stays the same no matter how the objects are arranged or counted.
Estimate the number of objects in a group up to 100, compare estimates, and justify which estimate is most reasonable.

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Curriculum details

Strand: Number (Strand 1)
Sub-strand: Number: Counting, Representation, Cardinality & Ordinality (1.1)
Content standard: B1.1.1.1 - Describe numbers and the relationship between numbers 0 to 100
Indicator: B1.1.1.1.1 - Use number names, counting sequences and how to count to find out "how many?"
Suggested placement: Term 1, Week 1 (Week 1 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. 2
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

E.g. 1. Count by 1s (forwards and backwards) between two given numbers between 0 and 100; or by 2s and 10s; Identify and correct errors or omissions in counting or skip counting sequences
E.g. 2. Count to answer "how many?" questions about as many as 100 objects arranged in a line, a grid or a circle; Show that the count of a group of up to 100 objects does not change regardless of the order in which the objects are counted or the arrangement of the objects
E.g. 3. Estimate the number of objects in a small group (up to 100) and describe the estimation strategy used; Select an appropriate estimate among all those given for a group of up to 100 objects and justify the choice
E.g. 4. Represent the number of objects in a group with a written numeral 0 to 100. Use ordinal numbers to describe the position of objects up to 10th place