The World of Numbers
Exercise 3.2
Integers
7 questions
Class 9 · Maths
NCERT
Q1
The temperature in the high-altitude desert of Ladakh is recorded as 4 °C at noon. By midnight, it drops by 15 °C. What is the midnight temperature?
Q2
A spice trader takes a loan (debt) of ₹850. The next day, he makes a profit (fortune) of ₹1,200. The following week, he incurs a loss of ₹450. Write this sequence as an equation using integers and calculate his final financial standing.
Q3 (i)
Calculate the following using Brahmagupta's laws:
(−12) × 5
Q3 (ii)
Calculate the following using Brahmagupta's laws:
(−8)x (−7)
Q3 (iii)
Calculate the following using Brahmagupta's laws:
0 − (−14)
Q3 (iv)
Calculate the following using Brahmagupta's laws:
(−20) ÷ 4
Q4
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).