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WEEK 8
TOPIC: BASIC OPERATIONS ON DIRECTED NUMBERS
CONTENT:
- 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 (backwards) of the number line counting each step till the subtraction is complete. The number at the end is the result of the subtraction.
MULTIPLICATION OF DIRECTED NUMBERS
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,
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