For Dimensional Analysis Problems:

1. Write the quantity as a product of powers of variables: Q = k*$x^a$$y^b$$z^c$
2. Write dimensional formulae of all quantities
3. Equate powers of M, L, T (and A, K if needed)
4. Solve the system of equations for a, b, c

For Error Analysis Problems:

1. Identify the formula relating the measured quantity to its variables
2. Determine the power of each variable
3. Apply the propagation rule: %error = sum of |power| * %error of each variable
4. The result is the maximum possible percentage error

For Instrument Reading Problems:

1. Calculate the least count
2. Read the main scale reading
3. Read the vernier/circular scale coincidence
4. Compute: Reading = MSR + (coincidence * LC)
5. Apply zero error correction: Corrected = Observed - (zero error)