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BASIC OPERATIONS ON DIRECTED NUMBERS
TOPICS
- Addition and Subtraction of Directed Numbers (Revision)
- Multiplication and Division of Directed Numbers
- Inverse and Identity
Addition and Subtraction of Directed Number Line (Revision)
Addition
To add using the number line, we move to the right (forward) of the number line counting each step till the addition is complete. The number at the end is the result of the addition.
Subtraction
To subtract using the number line, we move to the left (backward) of the number line counting each step till the subtraction is complete. The number at the end is the result of the subtraction.
1. Try out the exercises on this worksheet using the first representation as an example.
2. Use the number lines to solve each problem.
Multiplication of Directed Numbers
Multiplication is a short way of writing repeated additions. For example,
\(3 × 4 = 3\) lots of \(4\)
\(= 4 + 4 + 4\)
\(= 12\)
With directed numbers,
\((+4) + (+4) + (+4) = 3\) lots of \((+4)\)
\(= 3 × (+4)\)
The multiplier is \(3\).
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ClassHall Instructor
Ezimeruwe Oghenekaro
Halima Ahmadu
Sadiq Barau