Keystones — Lintel
Five GCSE retrieval questions · 23 December 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 6,400,000 in standard form
Answer: 6.4 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 72
Answer: (x + 8)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 40°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.68cm -
4. Ratio Mixed ratio problems
Simplify: 8:8:12
Answer: 2:2:3 -
5. Statistics Mean
The mean of 6 numbers is 40. If 5 of them are 48, 41, 36, 45, 39, what is the missing number?
Answer: 31