JSS1 First Term Mathematics Lesson Note – Whole Numbers

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WEEK 1

TOPIC:    WHOLE NUMBERS.

CONTENTS:

• Development of number system
• Place values
• Counting: tens; hundreds; thousands; millions; trillions
• Translating numbers written in figures to words.
• Quantitative reasoning.

 

DEVELOPMENT OF NUMBER SYSTEM

There were many ancient ways of writing numbers part of which are the Hindu Arabic system, tally system, Roman system, etc. While so many have gone into extinction, the Roman system is still in use up to date.

ROMAN NUMBER SYSTEM

The Roman number system was developed about 300BC. The Romans used capital letters of the alphabet for numerals. Table 1.1 shows how to use the letters.

Table 1.1

EXAMPLE 1: Write these numbers in Roman numerals.

1. a) 25 b) 105 c) 49 d) 2011

Solution

1. a) 25 = XXV
2. b) 105 = CV
3. c) 49 = XLIX
4. d) 2011 = MMXI

EXAMPLE 2: What numbers do these Roman numerals represent?

1. XLVI 2. XCIX 3. MMCMLIV    4. MMMDCI

Solution : 1. XLIV = 46       2. XCIX = 99    3. MMCMLIV = 2954     4. MMMDCI = 3601

CLASS ACTIVITY

1. Write these numbers in Roman Numerals
2. a) 352 b) 1 257 c) 2456
3. Add the following Roman numerals and give your answers in figures
4. a) XXV and CV b) XXIV and MDCIX.

What are whole numbers?

Whole Numbers are also called Integers. There are positive Integers and negative Integers. Examples of positive integers are 1, 2, 3, 4, 5, etc., while examples of negative integers are   – 1, – 2, – 3, – 4, – 5, etc.

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