Ratios and Proportion · B4 Mathematics

Lesson notes

Learning Objectives

Indicator: B4.1.4.1.2 - Round decimals to the nearest tenth

By the end of the lesson, learners can:

State the rule for rounding decimals to the nearest tenth, explaining that the rounded figure has exactly one digit after the decimal mark.
Identify the digit in the tenths place and the digit in the hundredths place of a given decimal number.
Round decimal numbers (tenths and hundredths) to the nearest tenth using the “look at the next digit” method.
Convert simple fractions to decimals and round the results to the nearest tenth.
Justify their rounding decisions by explaining why a number rounds up or stays the same based on the hundredths digit.

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Curriculum details

Strand: Number (Strand 1)
Sub-strand: Ratios and Proportion (1.4)
Content standard: B4.1.4.1 - Develop an understanding of decimals (tenths and hundredths) using concrete and pictorial representations and write decimal fractions as base ten numbers with place value.
Indicator: B4.1.4.1.2 - Round decimals to the nearest tenth
Suggested placement: Term 2, Week 4 (Week 16 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.
Source document note: The official curriculum document has a fault in this entry, so the curriculum text above is transcribed exactly as printed:

exemplars - p.26
Curriculum reference: Mathematics Curriculum for Primary Schools (Basic 4-6), 2019, p. 26
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

E.g. 1. Explain the rule for of rounding decimals, which is similar to that of rounding whole numbers. That is, rounding to the nearest tenth means that the rounded figure has one digit after the decimal mark. Rounding to the nearest hundredth means that the rounded figure has two digits after the decimal mark
E.g. 2. Use a table with several decimals fractions and explain the rule for of rounding decimals. Give pupils a table of decimal fractions to round to the nearest tenths or hundredths

Wide black-and-white mathematical teaching visual is organised as a table with horizontal divisions, vertical... — A wide black-and-white mathematical teaching visual is organised as a table with horizontal divisions, vertical divisions. Visible labels, values, and notation include: 100; 1 decimal or 1à; place; •; 85700; 85674.9.

E.g. 3. Ask students to change fractions to decimal writing their results to the nearest tenths or hundredths

Nearly square black-and-white mathematical teaching visual is organised as a table with horizontal divisions,... — A nearly square black-and-white mathematical teaching visual is organised as a table with horizontal divisions, vertical divisions. Visible labels, values, and notation include: A; Fraction; 0.38; B; 4.085; 56.584; D; 18.096; Nearest; 1; 10; IO; 100; Result; 0.4; жnnel.

 The E.g. 3 table (Fraction / Round to Nearest / Result, rows A 0.38 to E 30.084) is set below the exemplar and its cells interleave with the text; the figure shows it.