Keystones — Lintel
Five GCSE retrieval questions · 12 January 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0005 in standard form
Answer: 5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 33
Answer: (x + 3)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 16.87cm -
4. Ratio Mixed ratio problems
Simplify: 4:6:4
Answer: 2:3:2 -
5. Statistics Mean
The mean of 6 numbers is 35. If 5 of them are 24, 45, 37, 49, 43, what is the missing number?
Answer: 12