Keystones — Lintel
Five GCSE retrieval questions · 19 September 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000025 in standard form
Answer: 2.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 34°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.58cm -
4. Ratio Mixed ratio problems
In ratio 6:11:6, what fraction is the third part?
Answer: 6⁄23 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 48, 48, 26, what is the missing number?
Answer: 18