Keystones — Lintel
Five GCSE retrieval questions · 7 February 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 130,000,000 in standard form
Answer: 1.3 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 48
Answer: (x + 6)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 27°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.26cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2m : 20cm
Answer: 10:1 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 47, 34, 19, 46, 48, what is the missing number?
Answer: 40