Keystones — Lintel
Five GCSE retrieval questions · 25 February 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000023 in standard form
Answer: 2.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 40
Answer: (x + 8)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 46°. Find opposite. Give your answer to 2 decimal places
Answer: 13.46cm -
4. Ratio Mixed ratio problems
Simplify: 6:8:10
Answer: 3:4:5 -
5. Statistics Mean
Calculate the mean of: 13, 36, 7, 26, 13, 33, 8. Give your answer to 2 decimal places
Answer: 19.43