Counting, Representation… · B2 Mathematics

Lesson notes

Learning Objectives

Indicator: B2.1.1.1.3 - Use number names and non-standard units (marked 10s and 1s) for measuring (lengths and volumes) to count to find out “how long or how much?” up to 999

By the end of the lesson, learners can:

measure the length of classroom objects (tables, desks, windows) using non-standard units such as hand-spans, feet, strides, sticks, and threads, and state the result as a count up to 999.
measure the capacity of containers (buckets, basins, drums) using non-standard units such as cups, bottles, and tins, and state the result as a count up to 999.
group non-standard units into marked groups of 10s and 1s to read and say a total number (for example, 3 groups of 10 and 4 ones, read as “thirty-four”).
use number names correctly when reporting measurements, such as “two hundred and fifty-six hand-spans” or “eighty-three cups of water”.
explain why the number of units changes when a different non-standard unit is used to measure the same object.

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Curriculum details

Strand: Number (Strand 1)
Sub-strand: Counting, Representation, Cardinality & Ordinality (1.1)
Content standard: B2.1.1.1 - Count and estimate quantities from 0 to 1000
Indicator: B2.1.1.1.3 - Use number names and non-standard units (marked 10s and 1s) for measuring (lengths and volumes) to count to find out "how long or how much?" up to 999
Suggested placement: Term 1, Week 3 (Week 3 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. 21
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

E.g. 1. Have learners use their feet, strides, arms, hand-span and referent materials such as sticks or threads to find how long a table, window and door frames etc., by counting the number of times their feet, hand-span and referent materials is able to do this
E.g. 2. Have learners use empty container such as bottles, cups etc. to determine the capacity of other bigger containers by counting to find how much (the number of times) the bottles, cups etc. is able to do this