JSS1 First Term Mathematics Lesson Note – Whole Numbers II

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WEEK TWO

TOPIC: WHOLE NUMBERS

CONTENTS:

• Order of Operations (PEMDAS/ BODMAS)
• Addition and subtraction of numbers with place values
• Use of number line.
• Addition and subtraction of positive and negative numbers.

 

ORDER OF OPERATIONS (PEMDAS/ BODMAS)

Can you answer this?

7 – 1 x 0 + 3 ÷ 3 =  ?

In arithmetic, there are two types of components: the numbers themselves and the operators (also called operations) that tell you what to do with those numbers. The basic operators in arithmetic are addition (sum), subtraction (difference), multiplication (product) and division (quotient).

So, in the sum 7 x 3 + 5 there are three numbers; 7, 3 and 5 and two operators, a multiplication (x) and an addition (+). The order of operations used throughout mathematics, science, technology and many computer programming languages is expressed here.

1. exponents (index) and roots
2. multiplication and division
3. addition and subtraction

The definitive order of operations is summed up in the acronym BODMAS, which stands for Brackets, Order, Divide, Multiply, Add, Subtract. It would be easier if BODMAS was recognised worldwide, but unfortunately it isn’t.

In the USA it’s normally called PEMDAS (Parenthesis, Exponent, Multiply, Divide, Add, Subtract). Canadians sit in the middle with BEMDAS (Brackets, Exponent, Multiply, Divide, Add, Subtract).

Regardless of the exact terminology, the sequence remains the same:

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