Keystones — Lintel
Five GCSE retrieval questions · 3 June 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 1,500,000 in standard form
Answer: 1.5 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 21x + 108
Answer: (x - 9)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 63°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.8cm -
4. Ratio Mixed ratio problems
Simplify the ratio 1 hour : 35 minutes
Answer: 12:7 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 15, 46, 50, 20, 27, what is the missing number?
Answer: 58