Keystones — Lintel
Five GCSE retrieval questions · 18 April 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000052 in standard form
Answer: 5.2 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 45
Answer: (x + 5)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 64°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.59cm -
4. Ratio Mixed ratio problems
Simplify the ratio 8m : 25cm
Answer: 32:1 -
5. Statistics Mean
Calculate the mean of: 32, 39, 12, 46, 47, 34, 50. Give your answer to 2 decimal places
Answer: 37.14