JSS1 First Term Mathematics Lesson Note – Basic Operations on Whole Numbers

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WEEK 3

BASIC OPERATIONS ON WHOLE NUMBERS

CONTENTS:

• Multiplication of positive and negative numbers
• Division of integer
• Word problems

Multiplication of whole numbers

            The numbers used in multiplication have special names as illustrated below:

141(factor) x 17 (factor) = 2397 (product)

The product is a multiple of each of the factors, i.e.

2397 is a multiple of 141

2397 is a multiple of 17

Multiplication is a short way of writing repeated additions. For example,

3 x 4    = 3 lots of 4

=  4 + 4 + 4

= 12

With directed numbers,

(+4) + (+4) + (+4) = 3 lots of (+4)

= 3 X (+4)

The multiplier is 3. It is positive. Thus,

(+3) X (+4) = (+4) + (+4) + (+4) = +12

= 5 lots of (-2)

= 5 X (-2)

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