Keystones — Lintel
Five GCSE retrieval questions · 3 September 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.022 in standard form
Answer: 2.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 12
Answer: (x + 3)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 22.02cm -
4. Ratio Mixed ratio problems
Simplify: 8:10:10
Answer: 4:5:5 -
5. Statistics Mean
Calculate the mean of: 9, 26, 23, 27, 15, 29, 50. Give your answer to 2 decimal places
Answer: 25.57