Keystones — Lintel
Five GCSE retrieval questions · 11 August 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00086 in standard form
Answer: 8.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x + 8
Answer: (x + 8)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 57°. Find opposite. Give your answer to 2 decimal places
Answer: 23.cm -
4. Ratio Mixed ratio problems
Orange and purple sweets are in the ratio 8:4. What fraction of the sweets are orange?
Answer: 2⁄3 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 48, 44, 35, what is the missing number?
Answer: 5