Understanding that negative numbers represent values below zero, using temperature as the primary context (e.g., -5°C means 5 degrees below freezing).
Where your child meets this in real life: Understanding weather forecasts in winter, freezer temperatures, or reports about cold countries
SEAGReady breaks understand negative numbers into 2 steps, taught in order so each skill builds on the last.
Understand that negative numbers represent values below zero (e.g., -5°C means 5 degrees below freezing)
Compare negative numbers correctly, understanding that -10 is less than (colder than) -5
Three free sample questions from our understand negative numbers course. Every question comes with a full explanation, and hints that guide without giving the answer away.
Sean checks the weather in Newry. The thermometer shows -3 degrees Celsius. How many degrees below freezing is this temperature?
Answer: A. 3 degrees
The freezing point of water is 0 degrees Celsius. The minus sign in -3 degrees C means the temperature is below zero. The number 3 tells us it is 3 degrees below freezing. Answer: 3 degrees below freezing.
Stuck? Start here: What is the freezing point of water? (0 degrees Celsius)
Belfast recorded -4 degrees Celsius and Derry recorded -9 degrees Celsius. Which city had the colder temperature?
Answer: A. Derry (-9 degrees C)
Both temperatures are negative (below zero). To compare, think about which is further below zero. -9 is further from zero than -4. Further below zero means colder. Derry at -9 degrees C is colder than Belfast at -4 degrees C. Answer: Derry (-9 degrees C) was colder.
Stuck? Start here: Both temperatures are below zero. Which one is further below zero?
Aoife's freezer shows a temperature of -18 degrees Celsius. How many degrees below zero is this?
Answer: A. 18 degrees
Zero degrees Celsius is the freezing point. The minus sign tells us -18 degrees C is below zero. The number 18 tells us how many degrees below: 18 degrees. Answer: 18 degrees below zero.
Stuck? Start here: Zero degrees (0 degrees C) is the freezing point. The freezer is colder than this.
This is the exact interactive worked example your child sees in SEAGReady. Step through it and watch the method build up.
Ciara checks the weather forecast for Belfast. The thermometer shows the temperature is −5°C.
How many degrees below freezing is this temperature?
−5°C
Step 1 of 4
Ciara checks the weather forecast for Belfast. The thermometer shows the temperature is −5°C.
How many degrees below freezing is this temperature?
The temperature is 5 degrees below freezing.
The key insight: The minus sign means 'below zero' - think of going underground!
Watch out: Thinking −5°C is warmer than 0°C. Negative means below zero, so −5°C is actually colder than freezing point.
These are the misconceptions we see most often in understand negative numbers, including the ones our practice questions are specifically designed to catch.
Struggling with understand negative numbers? The real gap is often in one of these earlier topics.
SEAGReady finds the exact step where your child gets stuck, teaches it with worked examples like the one above, and brings it back for review so it sticks.