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The weather page shows −4°C. How can a number be below zero?

Chapter 10 of your NCERT book is The Other Side of Zero.

What you will learn

• Below zero. The line continues with steps of the same size.
• Reading the line. What the dash in −3 says.
• Which is less. Put both numbers on the line.
• Opposites. Every number has a partner across zero.
• Moving. Add walks right. Take away walks left.
• Where we see them. Cold days, building levels and game scores.