Keystones — Lintel
Five GCSE retrieval questions · 2 July 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.013 in standard form
Answer: 1.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 9
Answer: (x + 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 49°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.34cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 1:2:8. What fraction of the sweets are pink?
Answer: 8⁄11 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 34, 24, 48, what is the missing number?
Answer: 22