Introduction:
In CBSE Class 10 mathematics, it is possible to encounter questions that require estimation or approximation. These types of questions aim to assess a student's ability to make reasonable guesses or approximations when solving mathematical problems. Estimation and approximation skills are essential in real-life situations where exact calculations may not be feasible or necessary.

Importance of Estimation and Approximation:
Estimation and approximation skills are crucial in various fields of study and professions, including engineering, science, economics, and finance. These skills help individuals make quick and reasonable calculations, especially when dealing with large numbers or complex calculations. It allows them to check the reasonableness of their answers, save time, and make informed decisions based on approximations.

Types of Questions:
1. Estimating Results: In some questions, students may be required to estimate the result of a calculation without performing the exact calculations. For example, they may be asked to estimate the sum, difference, product, or quotient of two given numbers.

2. Approximating Measurements: Questions may involve approximating measurements, such as lengths, areas, volumes, or weights. Students may need to round off measurements to the nearest whole number or decimal place, depending on the given context.

3. Estimating Percentages: Questions related to percentages often require students to estimate the percentage increase or decrease in a given value. They may need to determine approximate values without calculating exact percentages.

4. Approximating Roots: Some questions may involve approximating square roots or cube roots of given numbers. Students may be asked to provide an approximate value rather than the exact value.

Strategies for Estimation and Approximation:
1. Rounding: One common strategy is to round off numbers to a convenient degree of accuracy. For example, rounding to the nearest whole number or decimal place can simplify calculations.

2. Front-end Estimation: Front-end estimation involves approximating numbers by considering only the leading digits. By ignoring the trailing digits, students can quickly estimate the sum or difference of two numbers.

3. Benchmarking: Benchmarking involves using known values or benchmarks to estimate unknown quantities. For example, estimating the total cost of items by comparing them to the price of a benchmark item.

4. Order of Magnitude Estimation: This strategy involves approximating numbers to the nearest power of 10. It helps in quickly determining the relative size or scale of quantities.

Conclusion:
Estimation and approximation skills are valuable in mathematics and everyday life. CBSE Class 10 mathematics may include questions that require students to estimate or approximate results, measurements, percentages, or roots. Developing these skills will enable students to make reasonable calculations, check the reasonableness of their answers, and solve problems efficiently. Practicing estimation and approximation techniques will enhance students' overall mathematical abilities and prepare them for real-life applications.