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- Quick checks on eigenvalues and diagonalisation using trace. Quick checks on inequalities using diagrams. Quick check on vector calculations using the Classwiz.
- Edexcel’s “specimen” FP3 paper, marked up with answers to check (some correct, some not)
- That paper, checked
- Edexcel’s “mock” FP3 paper, marked up with answers to check (some correct, some not)
- Those answers, checked
- An FP2 paper, marked up with answers to check
- Those answers, checked
- General guide to checking your answers

**General guidelines for quick checks on answers**

- Where you can, substitute your answer back into the question. If it’s an indefinite integral, differentiate it and see if you get the formula in the question. If it’s an inverted matrix, multiply it by the original matrix and see if you get the identity. If you have to find the equation of a plane passing through points, substitute those points into the equation you’ve got and see if they all satisfy it…
- If the answer is a general formula derived from another general formula in the question, then put the variable or variables equal to easy-to-deal-with values, 0 or 1, and see if your answer looks right
*Draw a rough diagram*, or use the diagram given in the question paper.- Look for clues in the question as to what the examiners expect the answer to be (as in Q.7 in the “specimen” paper)
- Check sum of eigenvalues = trace of matrix
- Use a powerful calculator to check your definite integrals and your matrix inversions