Keystones — Lintel
Five GCSE retrieval questions · 3 May 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 3,200,000 in standard form
Answer: 3.2 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 21
Answer: (x + 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 26°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.67cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 2:7:11. What fraction of the sweets are pink?
Answer: 11⁄20 -
5. Statistics Mean
Calculate the mean of: 5, 20, 47, 10, 5, 34, 24. Give your answer to 2 decimal places
Answer: 20.71