Solving numerical problems in MDCAT Physics and Chemistry requires a systematic approach and practice. Here are seven steps that can help you tackle these numerical effectively:

**For MDCAT Physics:**

1. **Understand the Concept:** Before attempting any numerical, ensure that you understand the underlying concept related to the problem. Break down the problem into its key components and understand how they are interconnected.

2. **Identify Given and Required Values:** Clearly identify the values given in the problem (such as distances, masses, velocities, etc.) and the value you are required to find. Organize this information in a clear manner.

3. **Select the Appropriate Formula:** Physics problems often involve the application of specific formulas or equations. Choose the formula that is relevant to the problem and will allow you to solve for the required value.

4. **Substitute Values:** Plug in the given values into the chosen formula and perform the necessary calculations. Pay attention to units, as they need to be consistent throughout the problem-solving process.

5. **Solve for the Unknown:** Manipulate the equation algebraically to solve for the unknown variable. This may involve rearranging terms, isolating the variable, and performing mathematical operations.

6. **Check Units and Magnitude:** Once you have calculated the numerical value, make sure it has the correct units and magnitude according to the problem's context. Check if your answer is reasonable based on your understanding of the concept.

7. **Review and Practice:** After solving the numerical, review your solution step by step to ensure accuracy. If you made any mistakes, try to identify where you went wrong. Practice similar problems from different sources to reinforce your problem-solving skills.

**For MDCAT Chemistry:**

1. **Conceptual Understanding:** Similar to physics, start by understanding the underlying chemical concepts related to the problem. This might involve understanding reaction mechanisms, stoichiometry, or other relevant concepts.

2. **List Given Information:** List out the given information, including reactant quantities, product quantities, reaction conditions, and any other relevant details.

3. **Balance Chemical Equations:** If the problem involves chemical reactions, balance the chemical equation to ensure the stoichiometry is correct. This will help you determine the ratios of reactants and products.

4. **Determine the Approach:** Decide on the approach you need to take, whether it's stoichiometry, gas laws, equilibrium calculations, or any other relevant concept.

5. **Apply the Appropriate Formula:** Apply the relevant formula or equation to solve for the unknown quantities. Make sure you're using the correct units and constants.

6. **Perform Calculations:** Perform the necessary calculations step by step. Double-check your arithmetic and ensure you're using accurate values.

7. **Check for Consistency:** Review your answer to ensure it is consistent with the problem's context. Check units, signs, and magnitudes to see if your answer makes sense.

Remember, both subjects require practice. The more problems you solve, the more comfortable you'll become with the concepts and problem-solving techniques. It's also a good idea to review your mistakes and learn from them.