Keystones — Lintel
Five GCSE retrieval questions · 24 October 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0004 in standard form
Answer: 4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 4
Answer: (x + 1)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 60°. Find adjacent side
Answer: 15cm -
4. Ratio Mixed ratio problems
Divide 90 in the ratio 1:4:4
Answer: 10, 40 and 40 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 25, 49, 37, 24, what is the missing number?
Answer: 10