Understanding Number Directions
In this page you will learn about Understanding Number Directions. Study or download the notes with questions and answers.
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Numbers have direction in terms of positive and negative values, indicating whether they represent a quantity above or below a defined reference point, usually zero. Positive numbers are greater than zero, while negative numbers are less than zero.
Positive Numbers:
These indicate a value greater than zero. They are often associated with gains, credits, or increases. For example, +50 rands means you have 50 rands.
Positive Balance: If you have R200 in your account, your balance is +R200. This means you have 200 rands available.
Negative Numbers:
These indicate a value less than zero. They are often associated with losses, debits, or decreases. For example, -30 rands means you owe 30 rands.
Negative Balance: If you have an overdraft of R100, your balance is -R100. This means you owe the bank 100 rands.
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Number Line
A number line can help visualize this concept:
-100Â -50Â Â Â Â 0Â Â Â Â +50Â +100
  |—–|—–|—–|—–|—–|
- To the right of zero are positive numbers (e.g., +50, +100).
- To the left of zero are negative numbers (e.g., -50, -100).
Lets make another example using a bank account transaction
| Transaction | Amount | Balance |
| Initial Balance | R100 | +R100 |
| Deposit | R50 | +R150 |
| Withdrawal | R200 | -R50 |
| Deposit | R100 | +R50 |
Initial Balance: +R100
- Deposit R50: +R100 + R50 = +R150
- Withdrawal R200: +R150 – R200 = -R50
- Deposit R100: -R50 + R100 = +R50
In this example:
- Positive balances (+R150, +R50) show how much money is available.
- Negative balance (-R50) shows the amount owed.
Understanding the direction of numbers helps in managing finances, determining profit or loss, and comprehending various financial scenarios.
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Exercises
1. Morning Temperatures
At 6:00 AM, the temperature is -4°C.
At 9:00 AM, the temperature is 2°C.
Calculate the change in temperature from 6:00 AM to 9:00 AM.
2. Afternoon Temperatures:
At 12:00 PM, the temperature is 10°C.
At 3:00 PM, the temperature increases by 8°C.
What is the temperature at 3:00 PM?
3. Evening Temperatures:
At 6:00 PM, the temperature is 18°C.
By 9:00 PM, the temperature drops by 7°C.
What is the temperature at 9:00 PM?
Answers
1.
=2°C−(−4°C)
=2°C+4°C
=6°C
2.
10°C+8°C=18°C
3.
18°C−7°C=11°C
Practice More ExcercisesOther Notes Under: Understanding Number Formats And Conversions
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ENGLISH HOME LANGUAGE PAPER 1 GRADE 11 (Questions With Explained Answers) NOVEMBER 2020
