If you owe 15 rupees and someone forgives a 5 rupee debt, your net worth rises to 10 rupees. Removing a negative financial burden functions exactly like receiving a positive cash gift.
Explain, using a real-world example of debt, why subtracting a negative number is the same as adding a positive number (e.g., 10 – (–5) = 15).
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Imagine you have 10 rupees in cash but also owe a friend 5 rupees, making your total financial position 10 minus 5. If your friend generously cancels or subtracts that 5 rupee debt, you no longer owe that money. Removing this negative financial burden increases your net worth back to 15 rupees. Mathematically, removing a debt of 5 is written as 10 minus negative 5, which gives the exact same result as adding 5 rupees.
For more NCERT Solutions for Class 9 Maths Ganita Manjari Chapter 3 The world of numbers (2026-27):
https://www.tiwariacademy.com/ncert-solutions/class-9/maths/ganita-manjari-chapter-3/