Keystones — Lintel
Five GCSE retrieval questions · 11 October 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00013 in standard form
Answer: 1.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 21
Answer: (x + 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 50°. Find adjacent side. Give your answer to 2 decimal places
Answer: 10.28cm -
4. Ratio Mixed ratio problems
Simplify: 12:12:6
Answer: 2:2:1 -
5. Statistics Mean
Calculate the mean of: 10, 39, 11, 16, 18, 8, 23. Give your answer to 2 decimal places
Answer: 17.86