B5 Mathematics · Term 2 Week 4: Ratios and Proportion

Lesson notes

Learning Objectives

Indicator: B5.1.4.1.3 - Round decimals to the nearest tenth and hundredth

By the end of the lesson, learners can:

State the rule for rounding decimals to the nearest tenth: look at the digit in the hundredths place, and if it is 5 or more, round up; if it is less than 5, round down.
State the rule for rounding decimals to the nearest hundredth: look at the digit in the thousandths place, and if it is 5 or more, round up; if it is less than 5, round down.
Round given decimals to the nearest tenth with accuracy, showing which digit was examined to make the decision.
Round given decimals to the nearest hundredth with accuracy, showing which digit was examined to make the decision.
Convert common fractions to decimals and round the results to the nearest tenth or hundredth as instructed.

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Curriculum details

Strand: Number (Strand 1)
Sub-strand: Ratios and Proportion (1.4)
Content standard: B5.1.4.1 - Demonstrate understanding of decimals fractions and strategies for comparing, adding and subtracting decimal fraction
Indicator: B5.1.4.1.3 - Round decimals to the nearest tenth and hundredth
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.79
Curriculum reference: Mathematics Curriculum for Primary Schools (Basic 4-6), 2019, p. 79
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

Figure from the b5 mathematics curriculum, printed page 79

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

 The Fraction / Round to Nearest / Result table (rows A 0.38 to E 30.084) is set beside E.g. 2 and E.g. 3 and its cells interleave with them in the text layer; the figure shows it.