Number and Numeration Systems · JHS1 Mathematics

Lesson notes

Learning Objectives

Indicator: B7.1.1.1.5 - Express decimal numerals to given significant and decimal places

By the end of the lesson, learners can:

Identify which zeros in a decimal numeral are significant and which are merely placeholders.
Round a given decimal numeral to a specified number of significant figures.
Round a given decimal numeral to a specified number of decimal places.
Determine the possible original values that could round to a given rounded measurement.
Justify their rounding decisions using the rules for significant figures and decimal places.

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Curriculum details

Strand: Number (Strand 1)
Sub-strand: Number and Numeration Systems (1.1)
Content standard: B7.1.1.1 - Demonstrate understanding and the use of place value for expressing quantities recorded as base ten numerals as well as rounding these to given decimal places and significant figures.
Indicator: B7.1.1.1.5 - Express decimal numerals to given significant and decimal places
Suggested placement: Term 1, Week 2 (Week 2 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. 6
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

E.g.1 Explain when zero (0) is significant in a decimal numeral
i. 0.360 (3sf) ii. 7.021 (4sf)
E.g.2. Round the following numbers to
i. 3sf
ii. 4sf
iii. 6sf
E.g.3. Express decimal numbers to a given number of decimal places
(i) 745.9674 correct to
-three decimal places
-two decimal places one decimal place
iii. Musa measured the length of his teacher's table and corrected his measurement to 2 decimal places as 0.76m. State the possible actual readings Musa might have obtained.
iv. Investigate similar problems on significant figures.