Lesson Notes By Weeks and Term v4 - JHS 3
Number Operations
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Number Operations
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Subject: Mathematics
Class: JHS 3
Term: 1st Term
Week: 8
Grade code: B9.1.2.2.1
Strand code: 3
Sub-strand code: 2
Content standard code: B9.1.2.2
Indicator code: B9.1.2.2.1
Theme: GEOMETRY AND MEASUREMENT
Subtheme: Number Operations
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Today, we are revisiting some very important tools in Mathematics: addition, subtraction, and multiplication. While these might seem simple, mastering how they work together is the key to solving complex, real-life problems. Think about a market woman at Makola Market. She must calculate her total sales (addition), give change to customers (subtraction), and figure out the total cost of buying items in bulk (multiplication). Without being able to combine these skills accurately, her business would suffer. This lesson will strengthen our ability to use these operations together to solve bigger and more interesting problems, preparing us for the BECE and for managing our own futures.
This lesson focuses on correctly combining addition, subtraction, and multiplication. The most important rule we must follow is the Order of Operations, commonly known in Ghana as BODMAS. What is BODMAS?
BODMAS is an acronym that tells us the correct sequence to solve mathematical problems that have more than one operation. B - Brackets () O - Orders (powers and square roots) D - Division (÷) M - Multiplication (×) A - Addition (+) S - Subtraction (-)
Important Rule: For Division and Multiplication, we work from left to right, whichever comes first. For Addition and Subtraction, we work from left to right, whichever comes first.
Since our indicator (B9.1.2.2.1) focuses on Addition, Subtraction, and Multiplication, our main focus will be on the M, A, and S in BODMAS. This means Multiplication must always be done before Addition and Subtraction.