**Solving Numericals in Physics and Chemistry without a Calculator for JEE**

When preparing for the Joint Entrance Examination (JEE), it is crucial to develop the ability to solve numerical problems in physics and chemistry without relying on a calculator. This skill is essential as calculators are not allowed during the exam. Here are some effective strategies and techniques to solve numerical problems without a calculator:

**1. Simplify the Problem**
- Carefully read the problem and identify the given values and what needs to be calculated.
- Simplify the problem by canceling out common terms or simplifying complex equations.
- Use scientific notations to express large or small numbers.

**2. Approximations**
- Round off numbers to make calculations easier. However, ensure that the level of approximation does not significantly affect the final answer.
- Use estimation techniques to quickly assess the magnitude of the answer.
- Utilize common scientific constants, such as the value of π (pi) or the value of the gravitational acceleration (g).

**3. Mental Math Techniques**
- Improve mental math skills by practicing mental calculations regularly.
- Break down complex calculations into simpler steps.
- Memorize basic arithmetic operations and common fractions to perform calculations quickly.

**4. Unit Conversions**
- Familiarize yourself with unit conversions and their relationships.
- Convert units to a more manageable form to simplify calculations.
- Use conversion factors and dimensional analysis to ensure the correct units are used throughout the problem.

**5. Problem-solving Strategies**
- Identify the relevant formulas and equations for the given problem.
- Substitute the given values into the equations and solve algebraically.
- Rearrange equations to isolate the desired variable for calculation.
- Use trial and error techniques when necessary to arrive at the correct answer.

**6. Focus on Conceptual Understanding**
- Develop a strong conceptual understanding of the topics in physics and chemistry.
- Understand the physical significance of the quantities involved in the problem.
- Apply fundamental principles and laws to guide your problem-solving approach.

Remember, regular practice is the key to improving your problem-solving skills without a calculator. Solve a variety of numerical problems from textbooks, previous year papers, and online resources to enhance your speed and accuracy. Additionally, time management during the exam is crucial, so practice solving problems under timed conditions to improve your efficiency.

EduRev provides a comprehensive collection of study materials, practice papers, and previous year question papers, which can be beneficial for your JEE preparation.

First, see the options and try to eliminate options.secondly, go for approximations rather than going to 100th part accuracy.In subjects like chemistry you can sometimes get correct option just by solving powers, specially in mole concept.in math try to make some common algebraic equations so that calculations gets easier.finally solve more and more problems and you will get confidence and accuracy.