- Disciplines using Maths
Support and Resources
- - Statistics Help
- - Arithmetic
- - Standard Derivatives
- - Standard Integrals
- - Hyperbolic Trigonometric Functions
- - Remainders and Quotients
- - Logic Basics: AND, OR, NOT
- - Approximations: rounding and truncation
- - Mathematical Terminology
- - Proportional Reasoning
- - Number Sense
- - I Don't Get It
- Events, Workshops and Programs
- Maths Education Research
- Contact the MESH team
More on Adding and Subtracting
Here are some examples involving temperature which illustrate the use of positive and negative integers.
The maximum temperature in Canberra on a day during winter was $3$ degrees Celsius.
The temperature dropped $5$ degrees to its minimum.
What was the minimum temperature in Canberra that day?
$3 – 5 = ?$
$3 – 5 = 2$ below zero
$3 – 5 = –2$
The minimum temperature in Canberra on another day in winter was $–2$ degrees Celsius.
The temperature rose $4$ degrees to its maximum.
What was the maximum temperature in Canberra that day?
$– 2 + 4 = ?$
The temperature in Perisher valley one evening was $-4$ degrees Celsius. Overnight the temperature fell $2$ degrees Celsius. What was the temperature in the morning?
$– 4 – 2 = ?$ Did you get $– 6?$
Try the following questions for yourself.