Number and Numeration Systems · JHS2 Mathematics

Lesson notes

Learning Objectives

Indicator: B8.1.1.1.5 - Express integers in a given number of significant and decimal places

By the end of the lesson, learners can:

Identify the significant figures in a given integer by locating the first non-zero digit and counting digits from that position.
Round any integer to a specified number of significant figures (e.g., 2, 3, or 4 significant figures) using the rules of rounding.
Round any decimal number to a specified number of decimal places (e.g., 2 or 3 decimal places).
Distinguish between rounding to significant figures and rounding to decimal places, and choose the correct method based on the problem given.
Apply rounding to significant figures and decimal places to solve practical problems involving large quantities and measurements.

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Curriculum details

Strand: Number (Strand 1)
Sub-strand: Number and Numeration Systems (1.1)
Content standard: B8.1.1.1 - Demonstrate understanding and the use of place value for expressing quantities in standard form and rounding numbers and decimals to significant figures and a given number of decimal places
Indicator: B8.1.1.1.5 - Express integers in a given number of significant and decimal places
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, Common Core Programme (JHS1-JHS3), 2023, p. 91
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

E.g.1. Express any given integer to a given number of significant figures.
(i) Express 56734 correct to two significant figures as 57000.
E.g. 2. Express 975.8674, correct to
(i) two decimal places;
(ii) three decimal places.