Understanding Number Systems Through Case Studies

The Case Study Class 9 Number System approach helps students connect theory with real-life applications. It covers rational numbers, irrational numbers, and their operations. Therefore, students develop deeper conceptual clarity.

Why Case-Based Learning Is Important

Case studies promote analytical thinking. Moreover, they prepare students for CBSE competency-based questions. As a result, confidence improves significantly.

Exam-Oriented Practice

The Case Study Class 9 Number System format reflects actual exam patterns. Consequently, students perform better under timed conditions. In addition, repeated practice strengthens logical reasoning.

Benefits for Students

These questions build problem-solving skills. Furthermore, they help avoid common mistakes. The Case Study Number System method supports long-term learning success.

Mathematics Case Study Quiz

Case Study Number system Class 9

An architect named Rohan is designing a high-tech sustainable park. He uses a specialized number line to mark the positions of various installations. The entrance of the park is treated as the origin (0). Rohan marks the position of a water fountain at a distance that is a rational number, specifically 2.35 units to the right of the entrance. To ensure the aesthetic balance, he needs to place a sculpture at a position represented by an irrational number, √2, which he approximates on the number line using a geometric spiral construction.

During the construction phase, Rohan encounters a problem where he needs to simplify the dimensions of a rectangular garden area. The length of the garden is given by the expression 1 / (√5 – 2) meters. To make the calculation easier for the laborers, he decides to rationalize the denominator. Furthermore, he calculates the total energy consumption of the park’s lighting system, which follows the laws of exponents. The power requirement for one sector is calculated as (5³ × 5⁻¹)¹/² units. Rohan must be extremely precise, as the difference between terminating decimals and non-terminating recurring decimals affects the sensor calibration of the automated irrigation system. He also notes that some measurements result in values like 0.1010010001… which cannot be expressed as a simple fraction, representing the increasing depth of the drainage pipes.

1. Rohan wants to represent the position of the water fountain (2.35) as a fraction in its simplest form. Which of the following represents this rational number?
Answer: (b) 47/20
Solution: To convert 2.35 to a fraction: 2.35 = 235/100. Dividing both by 5: 235 ÷ 5 = 47 and 100 ÷ 5 = 20. Thus, the fraction is 47/20.
2. The position of the sculpture is √2. Which of the following statements is true about this number based on its decimal expansion?
Answer: (c) It is a non-terminating non-recurring decimal.
Solution: √2 is an irrational number. By definition, the decimal expansion of an irrational number is non-terminating and non-recurring.
3. Simplify the length of the garden by rationalizing the denominator of the expression: 1 / (√5 – 2).
Answer: (c) √5 + 2
Solution: Multiply the numerator and denominator by the conjugate (√5 + 2): [1 * (√5 + 2)] / [(√5 – 2)(√5 + 2)] = (√5 + 2) / (5 – 4) = √5 + 2.
4. Calculate the power requirement for the lighting sector using the laws of exponents: (5³ × 5⁻¹)¹/².
Answer: (b) 5
Solution: First, 5³ × 5⁻¹ = 5⁽³⁻¹⁾ = 5². Next, (5²)¹/² = 5⁽² * ¹/²⁾ = 5¹ = 5.
5. The measurement 0.1010010001… for the drainage pipes is an example of:
Answer: (c) An Irrational Number
Solution: The number is non-terminating and non-recurring (the pattern of zeros changes). Thus, it is an irrational number.
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