Keystones — Lintel
Five GCSE retrieval questions · 29 January 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00099 in standard form
Answer: 9.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 20
Answer: (x + 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 55°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.06cm -
4. Ratio Mixed ratio problems
Simplify the ratio £1 : 35p
Answer: 20:7 -
5. Statistics Mean
Calculate the mean of: 35, 48, 22, 28, 30, 18. Give your answer to 2 decimal places
Answer: 30.17