Keystones — Lintel
Five GCSE retrieval questions · 3 September 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0094 in standard form
Answer: 9.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 63
Answer: (x + 7)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 32°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.9cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2m : 65cm
Answer: 40:13 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 44, 46, 18, 47, what is the missing number?
Answer: 10