Keystones — Lintel
Five GCSE retrieval questions · 9 August 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00037 in standard form
Answer: 3.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 18
Answer: (x + 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 55°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.47cm -
4. Ratio Mixed ratio problems
In ratio 6:1:1, what fraction is the first part?
Answer: 3⁄4 -
5. Statistics Mean
The mean of 4 numbers is 29. If 3 of them are 43, 21, 36, what is the missing number?
Answer: 16