Keystones — Lintel
Five GCSE retrieval questions · 3 September 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0048 in standard form
Answer: 4.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 40
Answer: (x + 5)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 9.86cm -
4. Ratio Mixed ratio problems
In ratio 8:12:4, what fraction is the first part?
Answer: 1⁄3 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 17, 33, 43, 30, what is the missing number?
Answer: 47